1. First Department of Internal Medicine, Wakayama Medical University, Wakayama 641-8509, Japan
2. Division of Clinical Nutrition and Metabolism, Wakayama Medical University, Wakayama 641-8509, Japan
3. Clinical Study Support Center, Wakayama Medical University, Wakayama 641-8509, Japan
4. Utsunomiya Ladies Clinic, Wakayama 640-8331, Japan