1. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Yeouido St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Occupational and Environmental Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3. Department of Urology, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. Healthcare Review and Assessment Committee, Health Insurance Review and Assessment Service, Wonju, Korea.
5. Acute Disease Assessment Division, Health Insurance Review and Assessment Service, Wonju, Korea.
6. Quality Assessment Management Division, Health Insurance Review and Assessment Service, Wonju, Korea.
7. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Gil Medical Center, Gachon University, Incheon, Korea.