1. Department of Molecular Endocrinology, National Research Institute for Child Health and Development, Tokyo 157-8535, Japan
2. Division of Pediatrics, Department of Homeostatic Regulation and Development, Niigata University Graduate School of Medical and Dental Sciences, Niigata 951-8510, Japan
3. Department of Pediatrics, Ojiya general Hospital, Niigata 947-8641, Japan
4. Department of Pediatrics, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan