1. Division of Respiratory Medicine and Rheumatology, Department of Multidisciplinary Internal Medicine, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan
2. Rheumatology/ Collagen Disease Medicine, Tottori Prefectural Central Hospital, Tottori 680-0901, Japan
3. Respiratory Medicine, National Hospital Organization Yonago Medical Center, Yonago 683-0006, Japan