1. Division of General Pediatrics, Saitama Children’s Medical Center, 2100 Magome, Iwatsuki-ku, Saitama 339-8551, Japan
2. Department of Pediatrics, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan
3. Department of Pediatrics, University of Tsukuba Hospital, 2-1-1 Amakubo, Tsukuba, Ibaraki 305-8576, Japan
4. Division of Gastroenterology, National Center for Child Health and Development, 2-10-1 Okura, Setagaya, Tokyo 157-8535, Japan
5. Department of Pediatrics, Gunma University Graduate School of Medicine, 3-39-22 Showa-machi, Maebashi, Gunma 371-0034, Japan
6. Department of Gastroenterology, Tokyo Metropolitan Children’s Medical Center, 2-8-29 Musashidai, Fuchu City, Tokyo 183-8561, Japan
7. Children’s Center for Health and Development, Saiseikai Yokohama Tobu Hospital, 3-6-1 Shimosueyoshi, Tsurumi-ku, Yokohama City, Kanagawa 230-0012, Japan
8. Department of General Pediatrics, Miyagi Children’s Hospital, 4-3-17 Ochiai, Aoba-ku, Sendai, Miyagi 989-3126, Japan
9. Department of Pediatric Gastroenterology, Nutrition and Endocrinology, Osaka Medical Center and Research Institute for Maternal and Child Health, Murodo-cho 840, Izumi-C, Osaka 594-1101, Japan
10. Department of Gastrointestinal and Pediatric Surgery, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu, Mie 514-8507, Japan
11. Department of Pediatric Surgery, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba City, Chiba 260-8677, Japan
12. Department of Pediatrics, Juntendo University Faculty of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
13. The Department of Pediatrics and Child Health, Kurume University School of Medicine, 67 Asahimachi, Kurume City, Fukuoka 830-0011, Japan