1. Department of Respiratory Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
2. Tohoku Medical and Pharmaceutical University Wakabayashi Hospital, Sendai, Japan
3. Division of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Ube, Japan
4. Osaki Citizen Hospital, Osaki, Japan
5. Iwate Prefectural Isawa Hospital, Oshu, Japan
6. National Hospital Organization Tokyo National Hospital, Kiyose, Tokyo, Japan