○Hayato Watanabe1,4, Atsushi Shimojo1,3, Kazuyoshi Takano2, Yoshitaka Ohnishi1,2, Hideaki Shiraishi3, Koichi Yokosawa1
(1.Faculty of Health sciences, Hokkaido University, Sapporo, Japan., 2.Graduate school of Health sciences, Hokkaido University, Sapporo, Japan., 3.Department of Pediatrics, Hokkaido University Graduate School of Medicine, Sapporo, Japan, 4.Department of Child Studies, Toyooka Junior College, Toyooka, Japan)
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