1. Division of Diabetes, Metabolism and Endocrinology Department of Internal Medicine The Jikei University School of Medicine 3‐25‐8 Nishishimbashi, Minato‐ku Tokyo 105‐8461 Japan
2. Tsunan Town Hospital 2682 Shimofunato, Tsunan‐machi, Nakauonuma‐gun Niigata 949‐8201 Japan