1. Department of Pediatrics, Kochi Medical School, Kochi University
2. Department of Pediatrics, School of Medicine, Yamagata University
3. Division of Pediatrics and Perinatology, Faculty of Medicine, Tottori University
4. Department of Pediatrics, Ehime University School of Medicine
5. Department of Pediatrics, Okayama University Graduate School of Medicine and Dentistry
6. Department of Pediatrics, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo