title: A prospective randomized study of the copper 7, Multiload Cu 250 and copper 220C IUDS in Singapore.
mesh_terms: D000328:Adult; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D007435:Intrauterine Devices, Copper; D011247:Pregnancy; D011446:Prospective Studies; D011897:Random Allocation