1 Department of Endocrinology, Metabolism and Diabetes, Kindai University Faculty of Medicine, 377-2 Ohno-higashi, Osaka-sayama, Osaka, 589-8511 Japan.
2 Department of Internal Medicine (I), Osaka Medical College, 2-7 Daigakucho, Takatsuki, Osaka 569-8686 Japan.
3 Department of Endocrinology and Diabetes, Saitama Medical University, Saitama, Japan.