1. Department of Clinical LaboratoryWomen and Children's HospitalSchool of MedicineXiamen University Xiamen 361003 P. R. China
2. Department of Laboratory MedicineNanfang HospitalSouthern Medical University Guangzhou 510515 P. R. China
3. Department of Clinical LaboratoryXiamen Cardiovascular HospitalSchool of MedicineXiamen University Xiamen 361006 P. R. China
4. School of MedicineXiamen University Xiamen 361102 P. R. China