Estrogens, Conjugated (USP)Estrogen Replacement TherapyMedroxyprogesterone AcetateEstrogensPostmenopauseEquileninProgestinsMastodyniaEstrogens, Esterified (USP)EquilinNorpregnenesMacaca fascicularisProgesterone CongenersOvariectomyMedroxyprogesteroneHysterectomyHormone Replacement TherapySelective Estrogen Receptor ModulatorsEstradiolMenopauseRaloxifeneReceptors, EstrogenEstroneEstrogen Receptor alphaPlacebosWomen's HealthDouble-Blind MethodEstrogen Receptor betaAdministration, OralHorsesDrug Therapy, CombinationRisk Factors