1. Medical College, Guizhou University, Guiyang, China
2. Department of Laboratory Medicine, Guizhou Provincial People’s Hospital, Guiyang, Guizhou, China
3. Prenatal Diagnostic Center, Guizhou Provincial People’s Hospital, Guiyang, Guizhou, China
4. Discipline Inspection and Supervision Office, Guizhou Provincial People’s Hospital, Guiyang, Guizhou, China.