1. The Sixth Affiliated Hospital of Guangzhou Medical University, Qingyuan City People's Hospital, Qingyuan 511518, Guangdong, China
2. Guangzhou Huali Science and Technology Vocational College, Guangzhou 511325, Guangdong, China
3. Dali University, Dali 671003, Yunnan, China
4. Department of Cardiology, The Second Affiliated Hospital of Guilin Medical University, Guilin 541001, Guangxi, China