1. Department of Laboratory MedicineNanfang HospitalSouthern Medical University Guangzhou 510515 P. R. China
2. Guangdong Engineering and Technology Research Center for Rapid Diagnostic BiosensorsNanfang HospitalSouthern Medical University Guangzhou 510515 P. R. China
3. Guangdong Provincial Key Laboratory of Single Cell Technology Application Guangzhou 510515 P. R. China
4. Department of Obstetrics and GynecologyNanfang HospitalSouthern Medical University Guangzhou 510515 P. R. China
5. Department of Laboratory MedicineDongguan Kanghua Hospital Dongguan 523080 P. R. China