1. Department of ECG Room, Chaohu Hospital affiliated to Anhui Medical University, Chaohu City, Hefei City, Anhui Province, China
2. Department of ECG Function, Zhejiang Provincial People’s Hospital, Hangzhou City, Zhejiang Province, China
3. Department of ECG Heart Function, The First Affiliated Hospital of Anhui Medical University, Hefei City, Anhui Province, China
4. Department of Cardiology, Liangzhou Hospital, Wuwei City, Gansu Province, China
5. Department of ECG, Jiaxing City First Hospital, Jiaxing City, Zhejiang Province, China
6. Department of General Practice, Chaohu Hospital Affiliated to Anhui Medical University, Chaohu City, Hefei City, Anhui Province, China
7. Department of ECG Room, Chaohu Hospital Affiliated to Anhui Medical University, Chaohu City, Hefei City, Anhui Province, China.