1. Department of Endocrinology and Diabetes Mellitus, Fukuoka University Chikushi Hospital, Chikushino, Fukuoka, Japan
2. Department of Internal Medicine, Nagasaki Prefecture Iki Hospital, Iki, Nagasaki, Japan
3. Clinical Research Support Center, Fukuoka University Chikushi Hospital, Chikushino, Fukuoka, Japan
4. Department of Preventive Medicine and Public Health, Faculty of Medicine, Fukuoka University, Fukuoka, Japan.