Y Taniguchi1, A Tamiya2, S Ishii2, S Atagi3. 1. Department of Internal Medicine, Sakai City, Osaka, Japan. Electronic address: yoshi-taniguchi@kch.hosp.go.jp. 2. Department of Internal Medicine, Sakai City, Osaka, Japan. 3. Clinical Research Center, National Hospital Organization Kinki-chuo Chest Medical Center, Sakai City, Osaka, Japan.