1. Faculty of Medicine, Oda Municipal Hospital, Oda Training Centre of General Practice, Shimane University, Oda-cho, Oda-shi, Shimane, Japan
2. Centre for Community-Based Healthcare Research and Education, Shimane University, Izumo-shi, Shimane, Japan
3. Graduate School of Public Health, Teikyo University, Itabashi-ku, Tokyo, Japan
4. Department of Preventive Medicine and Public Health, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan
5. Jinjukai Education and Training Centre for Healthcare Professionals, Nagahisa-cho, Oda-shi, Shimane, Japan
6. Kohoku Tsukihashi Clinic, Matsue-shi, Shimane, Japan
7. Faculty of Medicine, Department of General Medicine, Enya-cho, Izumo-shi, Shimane, Japan