1. Department of Respiratory Medicine, Kobe City Medical Center General Hospital, Kobe, Japan
2. Department of Medical Statistics, Translational Research Informatics Center, Kobe, Japan
3. Department of Respiratory Medicine, Maebashi Red Cross Hospital, Maebashi, Japan
4. Department of Respiratory Medicine, Ogaki Municipal Hospital, Gifu, Japan
5. Respiratory Disease Center, Tazuke Kofukai Foundation, Medical Research Institute, Kitano Hospital, Osaka, Japan
6. Department of Pulmonary Medicine, National Hospital Organization Matsue Medical Center, Matsue, Japan
7. Department of Respiratory Medicine, Kurashiki Central Hospital, Kurashiki, Japan
8. Department of Respiratory Medicine, St. Luke’s International Hospital, Tokyo, Japan
9. Department of Respiratory Medicine, National Hospital Organization Ehime Medical Center, Ehime, Japan; and
10. Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan