江苏省卫生厅重大项目科研基金H200707;江苏省科技厅社会发展基金BS2007073.BM2006113;江苏省实验诊断学重点实验室基金No.XK200731 Grants:Project of Health Administration of Jiangsu ProvinceH200707;Project of Jiangsu Science and Technology DepartmentBS2007073.BM2006113;Project of Key Laboratory of Laboratory Diagnosis of Jiangsu ProvinceXK200731