1. Department of Medical Education, Graduate School of Medicine, Chiba University, Chiba, Japan
2. Health Professional Development Center, Chiba University Hospital, Chiba, Japan
3. Department of Respirology, Graduate School of Medicine, Chiba University, Chiba, Japan
4. Department of General Medicine, Graduate School of Medicine, Chiba University, Chiba, Japan
5. Department of Community-Oriented Medical Education, Graduate School of Medicine, Chiba University, Chiba, Japan