1. Graduate School of Medicine, Kyoto University; Department of Gastroenterology and Hepatology; Kyoto Japan
2. National Hospital Organization Kinki Chuo Chest Medical Center; Department of Respiratory Medicine; Sakai Japan
3. Japanese Red Cross Wakayma Medical Center; Department of Respiratory Medicine; Wakayama Japan
4. Kyoto University Graduate School of Medicine/School of Public Health; Department of Health Promotion and Human Behavior; Yoshida Konoe-cho, Sakyo-ku Kyoto Kyoto Japan 606-8501