1. Department of Respiratory Medicine; National Hospital Organization; Kinki-Chuo Chest Medical Center; Osaka Japan
2. Department of Diffuse Lung Diseases and Respiratory Failure; National Hospital Organization; Kinki-Chuo Chest Medical Center; Osaka Japan
3. Division of Clinical Trial; National Hospital Organization; Kinki-Chuo Chest Medical Center; Osaka Japan
4. Department of Internal Medicine; National Hospital Organization; Kinki-Chuo Chest Medical Center; Osaka Japan
5. Bioscience Medical Research Center; Niigata University Medical and Dental Hospital; Niigata Japan