1. Department of Internal Medicine, Kinki Central Hospital, Itami 664-8533, Japan
2. Department of Metabolic Medicine, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
3. Department of Internal Medicine, Kawanishi City Hospital, Kawanishi 666-0195, Japan
4. Department of Internal Medicine, Keio University School of Medicine, Tokyo 160-8582, Japan
5. Department of Gastroenterology, Nissay Hospital, Osaka 550-0012, Japan
6. Department of Medicine, Nissay Hospital, Osaka 550-0012, Japan