1. Heart Failure and Structural Cardiology Ward The First Affiliated Hospital of Dalian Medical University Dalian Liaoning Province 116021 China
2. Department of Cardiology, West China Hospital Sichuan University Chengdu Sichuan Province 610041 China
3. Department of Emergency Medicine, Beijing Key Laboratory of Cardiopulmonary Cerebral Resuscitation, Beijing ChaoYang Hospital Capital Medical University Beijing 100020 China
4. Kent and Medway Medical School Canterbury Kent CT2 7NT UK