1. Department of Respiratory Medicine, Japanese Red Cross Kyoto Daini Hospital, Kyoto 602-8026, Japan
2. Department of Thoracic Oncology, Kansai Medical University Hospital, Hirakata 573-1191, Japan
3. Department of Respiratory Medicine, Asahi General Hospital, Asahi 289-2511, Japan
4. Department of Respiratory Medicine, Yao Tokushukai General Hospital, Yao 581-0011, Japan
5. Department of Respiratory Medicine, Uji-Tokushukai Medical Center, Uji 611-0041, Japan
6. Department of Pulmonary Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan
7. Department of Respiratory Medicine, Rakuwakai Otowa Hospital, Kyoto 607-8062, Japan
8. Department of Respiratory Medicine, Matsushita Memorial Hospital, Moriguchi 570-8540, Japan
9. Department of Respiratory Medicine, Japanese Red Cross Kyoto Daiichi Hospital, Kyoto 605-0981, Japan