1. Laboratory of Emergency Medical Services; Seoul National University Hospital Biomedical Research Institute; Seoul South Korea
2. Department of Emergency Medicine; Kyungpook National University Hospital; Daegu South Korea
3. Department of Emergency Medicine; Seoul National University Hospital; Seoul South Korea
4. Department of Emergency Medicine; Inje University Seoul Paik Hospital; Seoul South Korea
5. Department of Emergency Medicine; National Taiwan University; Taipei Taiwan
6. Accident and Emergency; Changi General Hospital; Singapore
7. Department of Emergency Medicine; Singapore General Hospital; Singapore