TY  - RPRT
TI  - Letter: Congenital abnormalities and first-trimester exposure to progestagen/oestrogen.
AU  - J J Nora
AU  - A H Nora
AU  - A G Perinchief
AU  - J W Ingram
AU  - A K Fountain
AU  - M J Peterson
PY  - 1976
DO  - 10.1016/s0140-6736(76)91455-0
UR  - https://pubmed.ncbi.nlm.nih.gov/55633/
ID  - 55633
ER  -