1. Department of Emergency Medicine, Beijing Chaoyang Hospital Capital Medical University Beijing China
2. Department of Emergency Medicine Beijing Huairou Hospital Beijing China
3. Department of Emergency Medicine, Sun Yat‐sen Memorial Hospital Sun Yat‐sen University Guangzhou China
4. Department of Emergency Medicine, Fujian Provincial Hospital, Fujian Institute of Emergency Medicine Fujian Medical University Fuzhou China
5. Beijing Key Laboratory of Cardiopulmonary Cerebral Resuscitation Beijing Chaoyang Hospital Beijing China