1. Clinical Research Center, National Hospital Organization Kinki-Chuo Chest Medical Center, Sakai City 591-8555, Osaka Prefecture, Japan
2. Department of Infectious Diseases, National Hospital Organization Kinki-Chuo Chest Medical Center, Sakai City 591-8555, Osaka Prefecture, Japan
3. Department of Internal Medicine, National Hospital Organization Kinki-Chuo Chest Medical Center, Sakai City 591-8555, Osaka Prefecture, Japan