Saeko Takahashi1, Morio Nakamura2. 1. Department of Pulmonary Medicine, Tokyo Saiseikai Central Hospital, 1-4-17, Mita, Minato-ku, Tokyo, 108-0073, Japan. saeko827@gmail.com. 2. Department of Pulmonary Medicine, Tokyo Saiseikai Central Hospital, 1-4-17, Mita, Minato-ku, Tokyo, 108-0073, Japan.