1. Department of Endocrinology and Diabetes, Yokohama City University Medical Center, Kanagawa 232-0024, Japan
2. Perinatal Center for Maternity and Neonate, Yokohama City University Medical Center, Kanagawa 232-0024, Japan
3. Department of Endocrinology and Metabolism, Yokohama City University School of Medicine, Kanagawa 236-0004, Japan