TY  - RPRT
TI  - Caution about chorionic villi sampling in the first trimester.
AU  - F Hecht
AU  - B K Hecht
AU  - H A Bixenman
PY  - 1984
DO  - 10.1056/nejm198405243102113
UR  - https://pubmed.ncbi.nlm.nih.gov/6717512/
ID  - 6717512
ER  -