一般演題口演　English Session-3

[EO-3-1] Children’s mobile phone use and change in behavior problems: 1-year follow-up study

*Ammara Ajmal¹, Keiko Yamazaki¹, Naomi Tamura¹, Yu Ait Bamai¹, Atsuko Ikeda^1,2, Reiko Kishi¹ (1. Center for Environmental and Health Sciences, Hokkaido University, Sapporo, Japan , 2. Faculty of Health Sciences, Hokkaido University, Sapporo, Japan )