1. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul St Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul,
2. Department of Public Health and Preventive Medicine, Chungbuk National University Hospital, Cheongju, Republic of Korea., Institute of Health & Science Convergence and
3. Institute of Health & Science Convergence and
4. Department of Public Health and Preventive Medicine, Chungbuk National University Hospital, Cheongju, Republic of Korea., Institute of Health & Science Convergence and, Department of Preventive Medicine, College of Medicine, Chungbuk National
University, Cheongju, Republic of Korea