TY  - RPRT
TI  - Chorionic villus sampling in first trimester and fetoscopy in second trimester.
AU  - B Gustavii
PY  - 1987
DO  - 10.1159/000413453
UR  - https://pubmed.ncbi.nlm.nih.gov/3556032/
ID  - 3556032
ER  -