1. Deparment of Trauma Surgery, Trauma Center, Chungbuk National University Hospital, Cheongju, South Korea
2. Department of Trauma Surgery, College of Medicine, Chungbuk National University, Cheongju, South Korea
3. Department of Thoracic and Cardiovascular Surgery, Chungbuk National University Hospital, Cheongju, South Korea
4. Department of Thoracic and Cardiovascular Surgery, College of Medicine, Chungbuk National University, Cheongju, South Korea