Letter: IUD and congenital malformation.
D000013:Congenital Abnormalities / Q000209:etiology*; D003300:Copper / Q000009:adverse effects; D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D007854:Lead / Q000009:adverse effects; D011247:Pregnancy
D007854:Lead; D003300:Copper