1. Department of Infectious Diseases, The University of Tokyo Hospital, Tokyo, Japan
2. Department of Infectious Diseases, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
3. Division of Medical Education, Juntendo University School of Medicine, Tokyo, Japan
4. Muribushi Okinawa Center for Teaching Hospitals, Urasoe, Okinawa, Japan
5. Tokyo Foundation for Policy Research, Tokyo, Japan