Endometrial HyperplasiaEndometrial NeoplasmsHyperplasiaEndometriumProgestinsVaginal SmearsUterine DiseasesPolypsCarcinoma, EndometrioidLevonorgestrelUterine HemorrhageEndometritisHysterectomyIntrauterine Devices, MedicatedUterine NeoplasmsCurettageContraceptive Agents, FemaleDilatation and CurettageLynestrenolPrecancerous ConditionsAnimals, ZooProstatic HyperplasiaAdenocarcinomaUterusCarcinoma in SituHysteroscopyImmunohistochemistryRats, Mutant StrainsWorld Health OrganizationAdrenal Hyperplasia, CongenitalLeiomyomaBiopsy