1 Department of Thoracic and Cardiovascular Surgery, Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea.
2 Department of Pediatrics, Pusan National University Hospital, Pusan National University School of Medicine and Biomedical Research Institute, Busan, Republic of Korea.
3 Department of Trauma Surgery, Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea. Electronic address: yinahn@naver.com.