1. Clinical Research Center National Hospital Organization Tokyo National Hospital, 3‐1‐1 Takeoka Tokyo Japan
2. Department of Health Services Research, Graduate School of Medicine The University of Tokyo Tokyo Japan
3. Department of Respiratory Medicine, Graduate School of Medicine The University of Tokyo Tokyo Japan
4. Department of Health Policy and Informatics Tokyo Medical and Dental University Graduate School Tokyo Japan
5. Department of Clinical Data Management and Research, Clinical Research Center National Hospital Organization Headquarters Tokyo Japan
6. Department of Clinical Epidemiology and Health Economics, School of Public Health, Graduate School of Medicine The University of Tokyo Tokyo Japan
7. Department of Respiratory Medicine National Hospital Organization Tokyo National Hospital Tokyo Japan