1. Lab Teaching and Management Center, Chongqing Medical University, Chongqing 400016, P.R. China
2. Department of Laboratory Medicine, The Ninth People's Hospital of Chongqing, Chongqing 400700, P.R. China
3. Outpatient Department, The General Hospital of Western Theater Command, Chengdu, Sichuan 610083, P.R. China