1 Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University Bundang Hospital, 82, Gumi-ro 173 Beon-gil, Bundang-gu, 13620, Seongnam, Gyeonggi-do, Republic of Korea.
2 Department of Internal Medicine, Seoul National University College of Medicine, 103, Daehak-ro, Jongno-gu, 03080, Seoul, Republic of Korea.
3 Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul Veterans Hospital, 53, Jinhwangdo-ro 61-gil, 05368, Gangdong-gu, Seoul, Republic of Korea.
4 Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University Bundang Hospital, 82, Gumi-ro 173 Beon-gil, Bundang-gu, 13620, Seongnam, Gyeonggi-do, Republic of Korea. dr.hjkim@snubh.org.
5 Department of Internal Medicine, Seoul National University College of Medicine, 103, Daehak-ro, Jongno-gu, 03080, Seoul, Republic of Korea. dr.hjkim@snubh.org.