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Gaina, A., Sekine, M., Hamanishi, S., Chen, X., Kanayama, H., Yama- gami, T., Williams, W. R., Heins, E., Seitz, C., Schüz, J., Toschke, A. M., Harth, K., Letzel, S., & B?hler, E. (2007). Bedtime, television and computer habits of primary school children in Germany. Ge- sundleitswesen, 69, 151-157.

has been cited by the following article:

• TITLE: Effects of Video Game Playing on the Circadian Typology and Mental Health of Young Czech and Japanese Children

  AUTHORS: Milada Krejci, Kai Wada, Miyo Nakade, Hitomi Takeuchi, Teruki Noji, Tetsuo Harada

  KEYWORDS: Chronotype, Video Game Playing, Circadian Typology, Mental Health

  JOURNAL NAME: Psychology, Vol.2 No.7, October 11, 2011

  ABSTRACT: The objective of this study is to examine the effects of video game playing on sleep-wake cycles and mental health of young Czech and Japan children. A cross-sectional survey with 497 Czech children (240 girls, 257 boys; mean age of 4.60 years; 49? - 51?N) and 599 Japanese children (314 girls, 285 boys: 3.79 years; 33?N) from 20 kindergartens and nursery schools. 20% and 30% of Czech and Japanese children had their own video game devices. Young children who played video games every day had later sleep and wake times (P