TY  - RPRT
TI  - Amniocentesis before 15 weeks' gestation: outcome, risks, and technical problems.
AU  - F W Hanson
AU  - E M Zorn
AU  - F R Tennant
AU  - S Marianos
AU  - S Samuels
PY  - 1987
DO  - 10.1016/0002-9378(87)90026-3
UR  - https://pubmed.ncbi.nlm.nih.gov/3591865/
ID  - 3591865
ER  -