1. Department of Clinical Laboratory, Jianghan Oilfield General Hospital of Changjiang University, Qianjiang, Hubei 433124, P.R. China
2. Department of Clinical Laboratory, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P.R. China
3. Department of Clinical Laboratory, The Affiliated Children Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710003, P.R. China