TY  - RPRT
TI  - Vaginosonography and chorionic villus sampling (CVS)
AU  - G Ghirardini
AU  - L W Popp
PY  - 1993
DO  - 10.1002/pd.1970130314
UR  - https://pubmed.ncbi.nlm.nih.gov/8347231/
ID  - 8347231
ER  -