1 Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Chungbuk National University College of Medicine and Chungbuk National University Hospital, Cheongju-si, Republic of Korea.
2 Division of Cardiology, Department of Internal Medicine, Chungbuk National University College of Medicine and Chungbuk National University Hospital, Cheongju-si, Republic of Korea.
3 Department of Radiology, Chungbuk National University College of Medicine and Chungbuk National University Hospital, Cheongju-si, Republic of Korea.
4 Department of Cardiac Rehabilitation, IRCCS Istituti Clinici Scientifici Maugeri, Milan, Italy.
5 Department of Intensive Care Medicine, Royal Perth Hospital, Perth, Australia.