1. Department of Metabolic Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
2. Department of Internal Medicine (I), Osaka Medical College, Takatsuki, Japan
3. Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Suita, Japan
4. Department of Urology, Graduate School of Medicine, Osaka University, Suita, Japan
5. Department of Diabetes Care Medicine, Graduate School of Medicine, Osaka University, Suita, Japan