1. Department of Clinical Laboratory, The Second Affiliated Hospital, Fujian Medical University, Quanzhou, Fujian 362000, P.R. China
2. Liver Cancer Institute, Zhongshan Hospital, Fudan University and Key Laboratory of Carcinogenesis and Cancer Invasion, Ministry of Education, Shanghai 200000, P.R. China
3. Reproductive Medicine Center, Yue Bei People's Hospital, Shantou University Medical College, Shaoguan, Guangdong 512026, P.R. China
4. Department of Clinical Laboratory, Yue Bei People's Hospital, Shantou University Medical College, Shaoguan, Guangdong 512026, P.R. China