1 Department of Respiratory Medicine and Rheumatology, Faculty of Medicine, Tottori University, 36-1 Nishimachi, Yonago 683-8504, Japan. Electronic address: watanabm@med.tottori-u.ac.jp.
2 Department of Respiratory Medicine and Rheumatology, Faculty of Medicine, Tottori University, 36-1 Nishimachi, Yonago 683-8504, Japan.