Osteoporosis, PostmenopausalOsteoporosisBone Density Conservation AgentsPostmenopauseBone DensityAlendronateEtidronic AcidDiphosphonatesFractures, BoneTeriparatideEstrogen Replacement TherapyBone ResorptionBone and BonesOsteoporotic FracturesRaloxifeneBone RemodelingMenopauseSelective Estrogen Receptor ModulatorsFractures, SpontaneousOvariectomyEstrogensAbsorptiometry, PhotonSpinal FracturesBone Diseases, MetabolicFemur NeckLumbar VertebraeSpinal InjuriesOsteoclastsOsteocalcinFemurThiophenesCalcium, DietaryRANK LigandEstrogens, Conjugated (USP)PhytoestrogensCalcitoninRisk FactorsBreast NeoplasmsPremenopauseEstradiolDouble-Blind MethodParathyroid HormoneAromatase InhibitorsOsteoprotegerinHormone Replacement TherapyOsteoblastsRepublic of BelarusOrganometallic CompoundsBiological MarkersDrug Administration ScheduleCollagen Type IHydroxycholecalciferolsAdministration, OralTamoxifenHip FracturesAlkaline PhosphataseEstroneNitrilesMedroxyprogesterone AcetateSex Hormone-Binding GlobulinCalciumTriazolesTreatment OutcomeIsoflavonesVitamin DProgestinsAntineoplastic Agents, HormonalClimactericGonadal Steroid HormonesCalcaneusNorpregnenesSpineRadiusMedroxyprogesteronePerimenopauseCase-Control StudiesTime FactorsUterine HemorrhageHot FlashesWomen's HealthHipPatient ComplianceProspective StudiesReceptors, EstrogenBody Mass IndexCohort StudiesAge FactorsSoybean ProteinsOsteogenesisEndometrial NeoplasmsNorethindroneGlucocorticoidsCross-Sectional StudiesRisk AssessmentDietary SupplementsDose-Response Relationship, DrugPlacebosTestosteroneEstrogen Receptor ModulatorsFollow-Up Studies