Published in
Wiley, Acta Paediatrica: Nurturing the Child, 8(107), p. 1439-1448
DOI: 10.1111/apa.14255
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National data showed that delayed sleep in six-year-old children was associated with excessive use of electronic devices at 12 years
Journal article published in 2018 by
Tsuguhiko Kato 
,
Takashi Yorifuji,
Michiyo Yamakawa,
Sachiko Inoue
,
Takashi Yorifuji,
Michiyo Yamakawa,
Sachiko Inoue
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