Histological changes on the chorion at failure of contraceptive intra-uterine devices.
D002823:Chorion / Q000648:ultrastructure*; D005321:Extraembryonic Membranes / Q000648:ultrastructure*; D005260:Female; D006801:Humans; D007434:Intrauterine Devices / Q000009:adverse effects*; D008854:Microscopy, Electron; D011247:Pregnancy