1. Children’s Medical Center, Yokohama City University Medical Center, Kanagawa 232-0024, Japan
2. Department of Pediatrics, Nihon University School of Medicine, Tokyo 101-8309, Japan
3. Igarashi Children’s Clinic, Miyagi 981-3203, Japan
4. Department of Pediatrics, Nippon Medical School, Tokyo 113-8602, Japan
5. Department of Pediatrics, Saitama Medical University, Saitama 350-0495, Japan
6. Department of Pediatrics, Tokyo Women’s Medical University Medical Center East, Tokyo 116-8567, Japan