1. Department of Emergency Medicine, Beijing Tiantan Hospital, Capital Medical University
2. Department of Emergency Medicine, Beijing Hospital of Traditional Chinese Medicine, Capital Medical University
3. Department of Emergency Medicine, Fuxing Hospital, Capital Medical University
4. Department of Emergency Medicine, Beijing Chaoyang Hospital, Capital Medical University
5. Department of Emergency Medicine, Beijing Luhe Hospital, Capital Medical University
6. Department of Emergency Medicine, Beijing Hospital
7. Department of Emergency Medicine, People's Hospital of Daxing District