1. Department of Cardiology, No. 215 Hospital of Shaanxi Nuclear Industry, Xianyang, Shaanxi 712000, P.R. China
2. Department of Cardiology, Xingyuan Hospital of Yulin City, Yulin, Shaanxi 719000, P.R. China
3. Department of Clinical Medicine, Medical College of Nanchang University, Nanchang, Jiangxi 330031, P.R. China
4. Department of Clinical Laboratory, Central Hospital of Xi'an City, Xi'an, Shaanxi 710003, P.R. China
5. Department of Internal Medicine, No. 5 Hospital of Xi'an City, Xi'an, Shaanxi 710082, P.R. China
6. Department of Clinical Laboratory, Central Hospital of Baoji City, Baoji, Shaanxi 721008, P.R. China
7. Department of Cardiovascular Medical Center, Dongguan Cardiovascular and Cerebrovascular Disease Hospital, The Affiliated Hospital of Yan'an University, Yan'an, Shaanxi 716000, P.R. China