1. General Medicine Center, Shimane University Hospital, Shimane, Japan.
2. Department of Medicine, University of Michigan Medical School, Ann Arbor, Michigan, USA.
3. Faculty of Medicine, Shimane University, Shimane, Japan.
4. Post Clinical Training Center, Shonan Atsugi Hospital, Kanagawa, Japan.
5. Muribushi Project for Okinawa Residency Programs, Okinawa, Japan.