1. Department of Laboratory Medicine, The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, P. R. China
2. Maternity and Child Health Care of Guangxi Zhuang Autonomous Region, Nanning 530005, P. R. China
3. Department of Radiology, The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, P. R. China
4. Department of Blood Transfusion, The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, P. R. China