1. Department of CardiologyInstitute of Cardiovascular DiseasesFirst Affiliated Hospital of Dalian Medical University Dalian 116011 China
2. Department of Emergency MedicineBeijing Key Laboratory of Cardiopulmonary Cerebral Resuscitation, Beijing Chaoyang HospitalCapital Medical University Beijing 100020 China
3. School of Public HealthDalian Medical University Dalian 116044 China