1. Department of Pediatrics; Shiga Medical Center for Children; Shiga Japan
2. Department of Pediatrics; Graduate School of Medicine; Kyoto University; Kyoto Japan
3. Kyoto University Health Service; Kyoto Japan
4. Department of Clinical Epidemiology; Hyogo College of Medicine; Nishinomiya Hyogo Japan
5. Division of Applied Life Sciences; Graduate School of Life and Environmental Sciences; Kyoto Prefectural University; Kyoto Japan