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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">sredob</journal-id><journal-title-group><journal-title xml:lang="ru">Здоровье населения и среда обитания – ЗНиСО</journal-title><trans-title-group xml:lang="en"><trans-title>Public Health and Life Environment – PH&amp;LE</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2219-5238</issn><issn pub-type="epub">2619-0788</issn><publisher><publisher-name>ФБУЗ ФЦГиЭ Роспотребнадзора</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.35627/2219-5238/2021-29-10-34-40</article-id><article-id custom-type="elpub" pub-id-type="custom">sredob-688</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>Изменения способа и режимов пользования мобильным телефоном и их связь с самочувствием у младших школьников</article-title><trans-title-group xml:lang="en"><trans-title>Changes in the Method and Modes of Mobile Phone Use and Their Relationship with the Well-being in Junior Schoolchildren</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2940-1855</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вятлевa</surname><given-names>О. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Vyatleva</surname><given-names>О. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вятлева Ольга Алексеевна – кандидат биологических наук, ведущий научный сотрудник лаборатории комплексных проблем гигиены детей и подростков НИИ гигиены и охраны здоровья детей и подростков</p><p>Ломоносовский пр., д. 2, стр. 1, г. Москва, 119991</p></bio><bio xml:lang="en"><p>Olga A. Vyatleva, Cand. Sci. (Biol.), Lead Researcher, Laboratory of Complex Problems of Pediatric and Adolescent Health, Research Institute of Hygiene and Health of Children and Adolescents</p><p>Bldg 1, 2 Lomonosovsky Avenue, Moscow, 119991</p></bio><email xlink:type="simple">olgavyat@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кургaнский</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Kurgansky</surname><given-names>A. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курганский Александр Михайлович – кандидат медицинских наук, старший научный сотрудник лаборатории комплексных проблем гигиенической оценки и экспертизы НИИ гигиены и охраны здоровья детей и подростков</p><p>Ломоносовский пр., д. 2, стр. 1, г. Москва, 119991</p></bio><bio xml:lang="en"><p>Alexandr M. Kurgansky, Cand. Sci. (Med.), Senior Researcher, Laboratory of Complex Problems of Hygienic Evaluation and Expertise, Research Institute of Hygiene and Health of Children and Adolescents</p><p>Bldg 1, 2 Lomonosovsky Avenue, Moscow, 119991</p></bio><email xlink:type="simple">kurgansk@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГАУ «Национальный медицинский исследовательский центр здоровья детей» Минздрава России</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Medical Research Center for Children’s Health</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>10</day><month>11</month><year>2021</year></pub-date><volume>0</volume><issue>10</issue><fpage>34</fpage><lpage>40</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Вятлевa О.А., Кургaнский А.М., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Вятлевa О.А., Кургaнский А.М.</copyright-holder><copyright-holder xml:lang="en">Vyatleva О.A., Kurgansky A.M.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://zniso.fcgie.ru/jour/article/view/688">https://zniso.fcgie.ru/jour/article/view/688</self-uri><abstract><sec><title>Введение</title><p>Введение. Значительные изменения в способах и режимах использования мобильного телефона (МТ) у современных младших школьников и недостаточная изученность их последствий для здоровья определили актуальность и цель настоящего исследования.</p><p>Цель исследования – оценить динамику пользования МТ у учащихся начальной школы и его влияние на самочувствие детей.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. В проспективном когортном исследовании (2017–2019 годы) 47 младших школьников (25 мальчиков и 22 девочки) с помощью анкет оценили изменения типа МТ, режимов голосового общения и пользования мобильным Интернетом (МИ), а также динамику частоты жалоб на самочувствие, в том числе клинически значимых (КЗЖ) (несколько в неделю). У 23 детей измеряли уровень излучения МТ.</p></sec><sec><title>Результаты</title><p>Результаты. За время наблюдения отмечено снижение уровня излучения МТ (p = 0,002); увеличение доли детей, использующих МИ (с 57,4 до 85,1 %, p = 0,006); повышение частоты (p = 0,002) и длительности (p = 0,01) его использования; приближение МТ к телу при ношении его днем (p = 0,01). К окончанию исследования возросла доля детей с КЗЖ на неудовлетворенность сном (с 23,4 до 40,4 %, p = 0,025) и тревогу (с 2,12 до 12,8 %, p = 0,043). Снижение уровня излучения МТ, переход к пользованию МИ и увеличение длительности использования МИ значимо коррелировали у детей с заменой «кнопочного» МТ на смартфон. Переход к пользованию смартфоном и МИ был связан с ростом КЗЖ на тревогу (p = 0,02) и трудности засыпания (p = 0,04).</p></sec><sec><title>Заключение</title><p>Заключение. Исследование показало, что у современных младших школьников, имеющих небольшой стаж пользования МТ, переход к использованию МТ в качестве мультимедийного средства является более важным фактором ухудшения самочувствия, чем длительность и интенсивность голосового общения по МТ.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background: Significant changes in the methods and modes of mobile phone (MP) use in modern primary schoolchildren and insufficient knowledge of their health consequences have determined the relevance and purpose of this study.</p></sec><sec><title>Objective</title><p>Objective: To assess the dynamics of MP use in primary school students and its impact on children’s well-being.</p></sec><sec><title>Materials and methods</title><p>Materials and methods: In 2017–2019, changes in the type of MP, modes of voice communication and mobile Internet (MI) use, and the dynamics of the health symptoms frequency were assessed in the prospective cohort study of 47 primary schoolchildren (25 boys and 22 girls) using questionnaires. MP radiation levels were measured for 23 children.</p></sec><sec><title>Results</title><p>Results: During the observation period, we noted a decrease in the level of MP radiation (p = 0.002); an increase in the proportion of children using MI (from 57.4 to 85.1 %, p = 0.006) and in the frequency (p = 0.002) and duration (p = 0.01) of MI use; keeping MP closer to the body in the daytime (p = 0.01). By the end of the study, we observed an increase in the proportion of children with clinically significant symptoms (CSS) of sleep disturbance (from 23.4 to 40.4 %, p = 0.025) and anxiety (from 2.12 to 12.8 %, p = 0.043). The decrease in MP radiation levels accompanied by an increase in the frequency and duration of MI use correlated with the replacement of the “push-button” MP with a smartphone. The switch to smartphone and MI usage was associated with an increase in CSS of anxiety (p = 0.02) and difficulty falling asleep (p = 0.043).</p></sec><sec><title>Conclusion</title><p>Conclusion: The study showed that in modern junior schoolchildren aged 7–10 with a short experience of MP usage, transition to using a MP as a multimedia device is a more important factor in impairment of well-being than the duration and intensity of MP voice communication.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>дети</kwd><kwd>мобильные телефоны</kwd><kwd>мобильный Интернет</kwd><kwd>жалобы на самочувствие</kwd><kwd>электромагнитное излучение</kwd></kwd-group><kwd-group xml:lang="en"><kwd>children</kwd><kwd>mobile phones</kwd><kwd>mobile Internet</kwd><kwd>health complaints</kwd><kwd>electromagnetic radiation</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Вятлева О.А., Курганский А.М. Особенности пользования мобильной связью (интенсивность излучения, временные режимы) и их влияние на показатели здоровья у современных младших школьников // Здоровье населения и среда обитания. 2018. № 8 (305). С. 51–54. doi: 10.35627/2219-5238/2018-305-8-51-54</mixed-citation><mixed-citation xml:lang="en">Vyatleva OA, Kurgansky AM. Features of using of mobile communication (intensity of radiation, temporary modes) and their influence on the health of modern younger schoolchildren. Zdorov'e Naseleniya i Sreda Obitaniya. 2018;(8(305)):51–54. (In Russ.) doi: 10.35627/2219-5238/2018-305-8-51-54</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Текшева Л.М., Барсукова Н.К., Чумичева О.А., Хатит З.Х. Гигиенические аспекты использования сотовой связи в школьном возрасте // Гигиена и санитария. 2014. Т. 93. № 2. С. 60–65.</mixed-citation><mixed-citation xml:lang="en">Teksheva LM, Barsukova NK, Chumicheva OA, Khatit ZKh. Hygienic aspects of cellular communication in school age. Gigiena i Sanitariya. 2014;93(2):60–65. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Chiu CT, Chang YH, Chen CC, Ko MC, Li CY. Mobile phone use and health symptoms in children. J Formos Med Assoc. 2015;114(7):598-604. doi: 10.1016/j.jfma.2014.07.002</mixed-citation><mixed-citation xml:lang="en">Chiu CT, Chang YH, Chen CC, Ko MC, Li CY. Mobile phone use and health symptoms in children. J Formos Med Assoc. 2015;114(7):598–604. doi: 10.1016/j.jfma.2014.07.002</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Durusoy R, Hassoy H, Özkurt A, Karababa AO. Mobile phone use, school electromagnetic field levels and related symptoms: a cross-sectional survey among 2150 high school students in Izmir. Environ Health. 2017;16(1):51. doi: 10.1186/s12940-017-0257-x</mixed-citation><mixed-citation xml:lang="en">Durusoy R, Hassoy H, Özkurt A, Karababa AO. Mobile phone use, school electromagnetic field levels and related symptoms: a cross-sectional survey among 2150 high school students in Izmir. Environ Health. 2017;16(1):51. doi: 10.1186/s12940-017-0257-x</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Вятлева О.А., Курганский А.М. Режимы пользования мобильным телефоном и здоровье детей школьного возраста // Гигиена и санитария. 2019. Т. 98. № 8. С. 857–862. doi: 10.18821/0016-9900-2019-98-8-857-862</mixed-citation><mixed-citation xml:lang="en">Vyatleva OA, Kurgansky AM. Modes of use of the cell phone and health of schoolchildren. Gigiena i Sanitariya. 2019;98(8):857–862. (In Russ.) doi: 10.18821/0016-9900-2019-98-8-857-862</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Вятлева О.А., Курганский А.М. Риски для здоровья, связанные с режимами использования и уровнем излучения мобильных телефонов у современных младших школьников // Гигиена и санитария. 2019. Т. 98. № 11. С. 1267–1271. doi: 10.18821/0016-9900-2019-98-11-1267-1271</mixed-citation><mixed-citation xml:lang="en">Vyatleva OA, Kurgansky AM. Risks for health associated with use modes and radiation level of cell phones in modern younger schoolchildren. Gigiena i Sanitariya. 2019;98(11):1267–1271. (In Russ.). doi: 10.18821/0016-9900-2019-98-11-1267-1271</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Redmayne M, Smith E, Abramson MJ. The relationship between adolescents’ well-being and their wireless phone use: a cross-sectional study. Environ Health. 2013;12:90. doi: 10.1186/1476-069x-12-90</mixed-citation><mixed-citation xml:lang="en">Redmayne M, Smith E, Abramson MJ. The relationship between adolescents’ well-being and their wireless phone use: a cross-sectional study. Environ Health. 2013;12:90. doi: 10.1186/1476-069x-12-90</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Григорьев Ю.Г., Хорсева Н.И. Мобильная связь и здоровье детей: оценка опасности применения мобильной связи детьми и подростками. Рекомендации детям и родителям. М.: Экономика; 2014, 229 с.</mixed-citation><mixed-citation xml:lang="en">Grigoryev YuG, Khorseva NI. [Mobile Communication and Children’s Health: Assessment of Dangers of Using Mobile Communication by Children and Adolescents: Recommendations for Children and Parents.] Moscow: Ekonomika Publ.; 2014. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Grigoriev YG, Khorseva NI. A longitudinal study of psychophysiological indicators in pupils users of mobile communications in Russia (2006–2017): children are in the group of risk. In: Markov M, ed. Mobile Communications and Public Health. N.W., Boca Raton, FL: CRC Press, 2018:237–253. doi: 10.1201/b22486-10</mixed-citation><mixed-citation xml:lang="en">Grigoriev YG, Khorseva NI. A longitudinal study of psychophysiological indicators in pupils users of mobile communications in Russia (2006–2017): children are in the group of risk. In: Markov M, ed. Mobile Communications and Public Health. N.W., Boca Raton, FL: CRC Press; 2018:237–253. doi: 10.1201/b22486-10</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Thomas S, Kühnlein A, Heinrich S, Praml G, von Kries R, Radon K. Exposure to mobile telecommunication networks assessed using personal dosimetry and well-being in children and adolescents: the German MobilEe-study. Environ Health. 2008;7:54. doi: 10.1186/1476-069x-7-54</mixed-citation><mixed-citation xml:lang="en">Thomas S, Kühnlein A, Heinrich S, Praml G, von Kries R, Radon K. Exposure to mobile telecommunication networks assessed using personal dosimetry and well-being in children and adolescents: the German MobilEe-study. Environ Health. 2008;7:54. doi: 10.1186/1476-069x-7-54</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Schoeni A, Roser K, Röösli M. Symptoms and the use of wireless communication devices: A prospective cohort study in Swiss adolescents. Environ Res. 2017;154:275–283. doi: 10.1016/j.envres.2017.01.004</mixed-citation><mixed-citation xml:lang="en">Schoeni A, Roser K, Röösli M. Symptoms and the use of wireless communication devices: A prospective cohort study in Swiss adolescents. Environ Res. 2017;154:275–283. doi: 10.1016/j.envres.2017.01.004</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Ikeda K, Nakamura K. Association between mobile phone use and depressed mood in Japanese adolescents: a cross-sectional study. Environ Health Prev Med. 2014;19(3):187–193. doi: 10.1007/s12199-013-0373-3</mixed-citation><mixed-citation xml:lang="en">Ikeda K, Nakamura K. Association between mobile phone use and depressed mood in Japanese adolescents: a cross-sectional study. Environ Health Prev Med. 2014;19(3):187–193. doi: 10.1007/s12199-013-0373-3</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Ferdous J. Mobile phone usage and awareness of health hazards among the adolescents in Sylhet city. Imp J Interdiscip Res. 2017;3(11):325–330.</mixed-citation><mixed-citation xml:lang="en">Ferdous J. Mobile phone usage and awareness of health hazards among the adolescents in Sylhet city. Imp J Interdiscip Res. 2017;3(11):325–330.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Liu S, Wing YK, Hao Y, Li W, Zhang J, Zhang B. The associations of long-time mobile phone use with sleep disturbances and mental distress in technical college students: a prospective cohort study. Sleep. 2019;42(2):zsy213. doi: 10.1093/sleep/zsy213</mixed-citation><mixed-citation xml:lang="en">Liu S, Wing YK, Hao Y, Li W, Zhang J, Zhang B. The associations of long-time mobile phone use with sleep disturbances and mental distress in technical college students: a prospective cohort study. Sleep. 2019;42(2):zsy213. doi: 10.1093/sleep/zsy213</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Вятлева О.А., Курганский А.М. Мобильные телефоны и здоровье детей 6–10 лет: значение временных режимов и интенсивность излучения // Здоровье населения и среда обитания. 2017. № 8(293). С. 27–30. doi: 10.35627/2219-5238/2017-293-8-27-30</mixed-citation><mixed-citation xml:lang="en">Vyatleva OA, Kurgansky AM. Mobile phones and health of children 6–10 years: importance of time modes and the radiation intensity. Zdorov'e Naseleniya i Sreda Obitaniya. 2017;8(293):27–30. (In Russ.) doi: 10.35627/2219-5238/2017-293-8-27-30</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Вятлева О.А., Курганский А.М. Влияние использования мобильного интернета на самочувствие, слухоречевую память и электроэнцефалограмму младших школьников. «Сысинские чтения – 2020»: материалы I национального конгресса с международным участием по экологии человека, гигиене и медицине окружающей среды. М.: ФГБУ «ЦСП» ФМБА России, 2020. C. 83–85.</mixed-citation><mixed-citation xml:lang="en">Vyatleva OA, Kurgansky AM. The impact of mobile internet use on well-being, auditory-speech memory and electroencephalogram of elementary school students. In: Proceedings of the First National Congress on Human Ecology and Environmental Health with international participation “Sysinskie Chteniya – 2020”, Moscow, November 19–20, 2020. Moscow: FGBU TsSP FMBA Rossii Publ.; 2020:83–85. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Hale L, Guan S. Screen time and sleep among school-aged children and adolescents: a systematic literature review. Sleep Med Rev. 2015;21:50–58. doi: 10.1016/j.smrv.2014.07.007</mixed-citation><mixed-citation xml:lang="en">Hale L, Guan S. Screen time and sleep among school-aged children and adolescents: a systematic literature review. Sleep Med Rev. 2015;21:50–58. doi: 10.1016/j.smrv.2014.07.007</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Wilmer HH, Sherman LE, Chein JM. Smartphones and cognition: A review of research exploring the links between mobile technology habits and cognitive functioning. Front Psychol. 2017;8:605. doi: 10.3389/fpsyg.2017.00605</mixed-citation><mixed-citation xml:lang="en">Wilmer HH, Sherman LE, Chein JM. Smartphones and cognition: A review of research exploring the links between mobile technology habits and cognitive functioning. Front Psychol. 2017;8:605. doi: 10.3389/fpsyg.2017.00605</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Tamana SK, Ezeugwu V, Chikuma J, et al. Screentime is associated with inattention problems in preschoolers: Results from the CHILD birth cohort study. PLoS One. 2019;14(4):e0213995. doi: 10.1371/journal.pone.0213995</mixed-citation><mixed-citation xml:lang="en">Tamana SK, Ezeugwu V, Chikuma J, et al. Screen-time is associated with inattention problems in preschoolers: Results from the CHILD birth cohort study. PLoS One. 2019;14(4):e0213995. doi: 10.1371/journal.pone.0213995</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Вятлева О.А. Влияние пользования смартфонами на самочувствие, когнитивные функции и морфофункциональное состояние центральной нервной системы у детей и подростков (обзор литературы) // Вопросы школьной и университетской медицины и здоровья. 2020. № 1. С. 4–11.</mixed-citation><mixed-citation xml:lang="en">Vyatleva OA. Influence of use of smartphones on well-being, cognitive functions and morphofunctional state of the central nervous system in children and adolescents (review). Voprosy Shkol’noy i Universitetskoy Meditsiny i Zdorov’ya. 2020;(1):4–11. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Falbe J, Davidson KK, Franckle RL, et al. Sleep duration, restfulness, and screens in the sleep environment. Pediatrics. 2015;135(2):e367–375. doi: 10.1542/peds.2014-2306</mixed-citation><mixed-citation xml:lang="en">Falbe J, Davidson KK, Franckle RL, et al. Sleep duration, restfulness, and screens in the sleep environment. Pediatrics.2015;135(2):e367–375. doi: 10.1542/peds.2014-2306</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Royant-Parola S, Legris S. Complex relationships between adolescents and their sleep (sleep patterns, use of new media, and impact on next day’s activity). J Dentofacial Anom Orthod. 2018;21(1):102–108. doi: 10.1051/odfen/2018040</mixed-citation><mixed-citation xml:lang="en">Royant-Parola S, Legris S. Complex relationships between adolescents and their sleep (sleep patterns, use of new media, and impact on next day’s activity). J Dentofacial Anom Orthod. 2018;21(1):102–108. doi: 10.1051/odfen/2018040</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Foerster M, Henneke A, Chetty-Mhlanga S, Röösli M. Impact of adolescentsʼ screen time and nocturnal mobile phone-related awakenings on sleep and general health symptoms: A prospective cohort study. Int J Environ Res Public Health. 2019;16(3):518. doi: 10.3390/ijerph16030518</mixed-citation><mixed-citation xml:lang="en">Foerster M, Henneke A, Chetty-Mhlanga S, Röösli M. Impact of adolescentsʼ screen time and nocturnal mobile phone-related awakenings on sleep and general health symptoms: A prospective cohort study. Int J Environ Res Public Health. 2019;16(3):518. doi: 10.3390/ijerph16030518</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
