HIGHLIGHTS
- who: Michiko Matsuoka and collaborators from the Survey procedure The design of the study and the procedures for obtaining informed consent were approved by the Medical Ethics Committee of School of Medicine, Kurume University, (No10110). Informed consent was obtained from each child`s parents prior to their participation in the study. A set of questionnaires, which included an instruction letter and an individual information sheet to provide physical information, children`s extracurricular activities, family structure, working condition of the parents or caregivers, the Japanese version of the SDQ (18, ), the Japanese version of the Children`s Sleep . . .
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