1. From the Department of Child Health, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan (H.H.); Ishikawa Clinic & Toyohashi University of Technology, Toyohashi, Aichi, Japan (Y.I.); Department of Pediatrics, Ibaraki Children's Hospital, Mito, Ibaraki, Japan (J.S.); Department of Pediatric Cardiology, Yokohama City University, Yokohama, Japan (M.I.); Department of Pediatrics and Child Health, Nihon University, School of Medicine, Tokyo, Japan (N.S.);...