1. Department of Pediatrics, Akita University Graduate School of Medicine, Akita, Japan
2. Department of Endocrinology, Diabetes and Geriatric Medicine, Akita University Graduate School of Medicine, Akita, Japan
3. Department of Child Studies, Kasei-Gakuin University, Tokyo, Japan
4. Department of Metabolic Diseases, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
5. Department of Health and Environmental Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan