1. Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Japan
2. Department of General Medicine, Yokohama City University School of Medicine, Japan
3. Department of Diagnostic and Generalist Medicine, Dokkyo Medical University Hospital, Japan
4. Division of General Medicine, Nerima Hikarigaoka Hospital, Japan
5. Department of General Medicine, Chiba University Hospital, Japan
6. General Medicine Center, Shimane University Hospital, Japan
7. Division of Hospital Medicine, VA Ann Arbor Healthcare System, USA