Rinku General Medical Center, Osaka 598-8577, Japan. National Center for Geriatrics and Gerontology, Aichi 474-8511, Japan. Department of Diabetes, Metabolism and Endocrinology, Chiba University Hospital, Chiba 260-8670, Japan. Department of Endocrinology, Hematology and Gerontology, Chiba University Graduate School of Medicine, Chiba 260-8670, Japan. Department of Metabolic Medicine, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan. Medical Affairs Department, Kowa Company, Ltd., Tokyo 103-8433, Japan. Clinical Data Science Department, Kowa Company, Ltd., Tokyo 103-8433, Japan. Division of Endocrinology and Metabolism, Department of Medicine, Jichi Medical University, Tochigi 329-0498, Japan.