1. Department of General Internal Medicine, Nara City Hospital, Japan
2. Department of Medicine, Tohoku University School of Medicine, Japan
3. Urasoe General Hospital, Japan
4. Hyogo Prefectural Amagasaki Hospital, Japan
5. Rakuwakai Otowa Hospital, Japan
6. National Medical Clinic, Japan
7. Division of General Internal Medicine, Tokyo Joto Hospital, Japan