1. From the Department of Child Health (H.H.), Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan; the Department of Cardiology (M.N.), Aichi Children’s Health and Medical Center, Ohbu, Japan; the Department of Pediatrics and Child Health (N.S.), Nihon University School of Medicine, Tokyo, Japan; the Department of Pediatrics (M.Y.), National Hospital Organization Kagoshima Medical Center, Kagoshima, Japan; the Department of Cardiology (H.U.), Fukuoka Children’s...