title: Letter: Congenital abnormalities and first-trimester exposure to progestagen/oestrogen.
mesh_terms: D000014:Abnormalities, Drug-Induced; D000015:Abnormalities, Multiple / Q000139:chemically induced*; D045166:Estradiol Congeners / Q000009:adverse effects*; D005260:Female; D005333:Fetus / Q000187:drug effects*; D006801:Humans; D007231:Infant, Newborn; D008431:Maternal-Fetal Exchange; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D045167:Progesterone Congeners / Q000009:adverse effects*; D011446:Prospective Studies
chemical_list: D045166:Estradiol Congeners; D045167:Progesterone Congeners