Division of Metabolism and Endocrinology, Department of Internal Medicine, St. Marianna University School of Medicine, 2-16-1, Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan. Electronic address: tomonaka@marianna-u.ac.jp. Division of Metabolism and Endocrinology, Department of Internal Medicine, St. Marianna University School of Medicine, 2-16-1, Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan. Electronic address: ynagai@marianna-u.ac.jp. Division of Metabolism and Endocrinology, Department of Internal Medicine, St. Marianna University School of Medicine, 2-16-1, Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan. Electronic address: y3yamamoto@marianna-u.ac.jp. Radioisotope and Chemical Analysis Center, Sanwa Kagaku Kenkyusho Co., Ltd., 363 Shisaki, Hokusei-cho, Inabe, Mie 511-0406, Japan. Electronic address: a_miyachi@mb4.skk-net.com. Radioisotope and Chemical Analysis Center, Sanwa Kagaku Kenkyusho Co., Ltd., 363 Shisaki, Hokusei-cho, Inabe, Mie 511-0406, Japan. Electronic address: h_hamajima@mb4.skk-net.com. Radioisotope and Chemical Analysis Center, Sanwa Kagaku Kenkyusho Co., Ltd., 363 Shisaki, Hokusei-cho, Inabe, Mie 511-0406, Japan. Electronic address: e_mieno@skk-net.com. Medical Informatics, St. Marianna University School of Medicine, 2-16-1, Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan. Electronic address: masaki.takahashi@marianna-u.ac.jp. Medical Informatics, St. Marianna University School of Medicine, 2-16-1, Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan. Electronic address: eisuke.inoue@marianna-u.ac.jp. Division of Metabolism and Endocrinology, Department of Internal Medicine, St. Marianna University School of Medicine, 2-16-1, Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan. Electronic address: y17tnk@marianna-u.ac.jp.