1. Department of Chest Surgery; Chungbuk National University Hospital; Chungju Korea
2. Samsung Advanced Institute for Health Sciences and Technology; Sungkyunkwan University; Seoul Korea
3. Department of Epidemiology; Johns Hopkins Bloomberg School of Public Health; Baltimore USA
4. Department of Health, Behavior and Society; Johns Hopkins Bloomberg School of Public Health; Baltimore USA
5. Department of Thoracic Surgery; Seoul National University Bundang Hospital; Seoul National University College of Medicine; Seoul Korea
6. Department of Thoracic Surgery; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea