1. Emegency Department Beijing Friendship Hospital, Capital Medical University Beijing China
2. Emegency Department Beijing Chaoyang Hospital, Technology Innovation Base of Beijing Key Laboratory of Cardiopulmonary Cerebral Resuscitation, Capital Medical University Beijing China
3. Emegency Department Beijing Fuxing Hospital, Capital Medical Universtiy Beijing China
4. Emegency Department Beijing Tongren Hospital, Capital Medical University Beijing China