1. Department of Emergency Medicine, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, P.R. China
2. Beijing Key Laboratory of Cardiopulmonary Cerebral Resuscitation, Beijing Chao‑Yang Hospital, Capital Medical University, Beijing 100020, P.R. China
3. Department of Radiology, Beijing Chao‑Yang Hospital, Capital Medical University, Beijing 100020, P.R. China