1. Department of Epidemiology and Preventive Medicine, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
2. Department of Gastroenterology and Metabology, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
3. Department of Internal Medicine, Yawatahama City General Hospital, Yawatahama, Ehime 796-8502, Japan
4. The Furukawa Clinic, Furukawa, Matsuyama, Ehime 790-0943, Japan
5. Department of Lifestyle-related Medicine and Endocrinology, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan
6. Department of Internal Medicine, Matsuyama Shimin Hospital, Otemachi, Matsuyama, Ehime 790-0067, Japan