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Irregular Bedtime and Nocturnal Cellular Phone Usage as Risk Factors for Being Involved in Bullying: A Cross-Sectional Survey of Japanese Adolescents

  • Mamoru Tochigi,

    Affiliation Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Tokyo, Japan

  • Atsushi Nishida,

    Affiliation Department of Schizophrenia Research, Tokyo Institute of Psychiatry, Tokyo, Japan

  • Shinji Shimodera ,

    shimodes@kochi-u.ac.jp

    Affiliation Department of Neuropsychiatry, Kochi Medical School, Kochi, Japan

  • Norihito Oshima,

    Affiliation Office for Mental Health Support, University of Tokyo, Tokyo, Japan

  • Ken Inoue,

    Affiliation Department of Public Health, Fujita Health University School of Medicine, Aichi, Japan

  • Yuji Okazaki,

    Affiliation Tokyo Metropolitan Matsuzawa Hospital, Tokyo, Japan

  • Tsukasa Sasaki

    Affiliation Department of Health Education, Graduate School of Education and Office for Mental Health Support, University of Tokyo, Tokyo, Japan

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