TY  - RPRT
TI  - Chorionic villus sampling versus early amniocentesis.
AU  - D Gurwitz
PY  - 1997
DO  - 10.1016/s0140-6736(05)63490-3
UR  - https://pubmed.ncbi.nlm.nih.gov/9652594/
ID  - 9652594
ER  -