1. Division of Metabolism and Biosystemic Science Department of Internal Medicine Asahikawa Medical University Asahikawa Japan
2. Division of Diabetology, Endocrinology and Nephrology Department of Internal Medicine Shiga University of Medical Science Otsu Japan
3. Immuno‐Biological Laboratories Co., Ltd. Fujioka Japan
4. Jiyugaoka Medical Clinic, Internal Medicine Obihiro Japan