1. Department of Respirology; Graduate School of Medicine; Chiba University; Chiba Japan
2. Department of Advanced Medicine in Pulmonary Hypertension; Graduate School of Medicine; Chiba University; Chiba Japan
3. Department of Respiratory Medicine and Allergy; Tosei General Hospital; Seto Aichi Japan
4. First Department of Medicine; Hokkaido University Hospital; Sapporo Japan
5. Department of Medicine; Tokyo Saiseikai Central Hospital; Tokyo Japan
6. Division of Cardiovascular Medicine, Department of Internal Medicine; Kobe University Graduate School of Medicine; Kobe Japan
7. Second Department of Internal Medicine; Nara Medical University; Kashihara Japan
8. First Department of Medicine; Obihiro-Kosei General Hospital; Obihiro Japan
9. First Department of Medicine; Shinshu University School of Medicine; Matsumoto Japan