Division of Laboratory Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China. Department of Epidemiology, School of Public Health, Southern Medical University, Guangzhou 510515, China. Division of Laboratory Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China; Department of Epidemiology, School of Public Health, Southern Medical University, Guangzhou 510515, China. Department of Epidemiology, School of Public Health, Southern Medical University, Guangzhou 510515, China. Electronic address: maochen9@smu.edu.cn. Division of Laboratory Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China. Electronic address: hzhou@smu.edu.cn.