1. Department of Respiratory Medicine, Faculty of Medicine Hokkaido University Sapporo Japan
2. Department of Advanced Medical Development The Cancer Institute Hospital of Japanese Foundation for Cancer Research Tokyo Japan
3. Department of Respiratory Medicine NHO Hokkaido Cancer Center Sapporo Japan
4. Department of Respiratory Medicine Teine Keijinkai Hospital Sapporo Japan
5. Department of Respiratory Medicine Miyagi Cancer Center Natori Japan
6. Department of Pulmonary Medicine Sendai Kousei Hospital Sendai Japan
7. Department of Respiratory Medicine Tohoku University Graduate School of Medicine Sendai Japan
8. Department of Respiratory Medicine Obihiro‐Kousei General Hospital Obihiro Japan
9. Department of Respiratory Medicine Hakodate Goryoukaku Hospital Hakodate Japan
10. Department of Respiratory Medicine Oji General Hospital Tomakomai Japan
11. Department of Pulmonary Medicine Steel Memorial Muroran Hospital Muroran Japan
12. Department of Respiratory Medicine Akita Kousei Medical Center Akita Japan
13. Department of Respiratory Medicine KKR Sapporo Medical Center Sapporo Japan
14. Department of Respiratory Medicine Kushiro City General Hospital Kushiro Japan
15. Department of Pulmonary Medicine Fukushima Medical University School of Medicine Fukushima Japan
16. Department of Respiratory Medicine National Hospital Organization Asahikawa Medical Center Asahikawa Japan
17. Department of Respiratory Medicine Yamagata Prefectural Central Hospital Yamagata Japan
18. Department of Respiratory Medicine Sapporo Minami‐Sanjo Hospital Sapporo Japan
19. Department of Respiratory Medicine, Graduate School of Medicine Hirosaki University Hirosaki Japan
20. Department of Respiratory Medicine Iwamizawa Municipal General Hospital Iwamizawa Japan