1. Department of Pediatrics, Teikyo University School of Medicine, Tokyo, Japan
2. Department of Pediatrics, Dokkyo Medical University Koshigaya Hospital, Koshigaya, Japan
3. Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan
4. Department of Pediatrics, Hamamatsu University School of Medicine, Hamamatsu, Japan
5. Department of Pediatric Cardiology, The Heart Institute, Tokyo Women’s Medical University, Tokyo, Japan
6. Department of Medical Subspecialties, National Center for Child Health and Development, Tokyo, Japan