1. Department of Emergency Medicine, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Biostatistics, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Emergency Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
4. Division of Cardiovascular Surgery, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Korea.
5. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University Health System, Seoul, Korea.