1. Department of Thoracic and Cardiovascular Surgery, Pusan National University Hospital, Biomedical Research Institute, Pusan National University School of Medicine, Busan, Korea
2. Department of Radiology, Pusan National University Hospital, Biomedical Research Institute, Pusan National University School of Medicine, Busan, Korea
3. Department of Medical Research Institute, Pusan National University, Busan, Korea
4. Heavy Metal Exposure Environmental Health Center, Dong-A University Hospital, Dong-A University, Busan, Korea