[Contraceptive ring and ectopic pregnancy].
D003270:Contraceptive Agents; D003273:Contraceptive Devices; D005260:Female; D006801:Humans; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000209:etiology*; D019736:Prostheses and Implants
D003270:Contraceptive Agents
CONTRACEPTIVES; PREGNANCY, ECTOPIC/etiology