1. Second Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan
2. Department of Disease Control, Graduate School of Veterinary, Medicine, Hokkaido University, Sapporo, Japan
3. Department of Developmental Medical Sciences, Graduate School of Medicine, the University of Tokyo, Tokyo, Japan
4. Hirotsu Clinic, Kawasaki, Japan
5. Kurashiki Central Hospital, Kurashiki, Japan
6. Department of Internal Medicine II, Oita University Faculty of Medicine, Yufu, Japan
7. St. Marianna University School of Medicine, Kawasaki, Japan