1. Department of Pulmonary Medicine, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-0841, Japan
2. Department of Respiratory Medicine, Japanese Red Cross Kyoto Daini Hospital, Kyoto 602-8026, Japan
3. Department of Medical Oncology, Fukuchiyama City Hospital, Fukuchiyama 620-8505, Japan
4. Department of Respiratory Medicine, Uji-Tokushukai Medical Center, Uji 611-0041, Japan