Shusuke Yazawa1, Mikio Toyoshima2, Keigo Koda1, Takafumi Suda3. 1. Department of Respiratory Medicine, Hamamatsu Rosai Hospital, Hamamatsu, Japan. 2. Department of Respiratory Medicine, Hamamatsu Rosai Hospital, Hamamatsu, Japan. Electronic address: mi-toyoshima@hamamatsuh.johas.go.jp. 3. Second Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Japan.