Ajou University School of Medicine - Department of Surgery, Ajou University School of Medicine - Department of Surgery, Ajou University School of Medicine - Department of Surgery, Ajou University School of Medicine - Department of Surgery, Ajou University School of Medicine - Department of Surgery, Cheju Halla General Hospital - Jeju Reginal Trauma Center, Pusan National University College of Medicine - Department of Trauma and Surgical Critical Care, Pusan National University College of Medicine - Department of Trauma and Surgical Critical Care, Dankook University College of Medicine - Department of Neurosurgery, Yonsei University Wonju College of Medicine - Department of Emergency Medicine, Korea National Open University - Department of Information and Statistics, National Medical Center (NMC) - National Emergency Medical Center, National Medical Center (NMC) - National Emergency Medical Center and Seoul National University - Department of Health Policy and Management