Famous PersonsHistory, 19th CenturyDatabases, BibliographicPhysical Therapy ModalitiesRandomized Controlled Trials as TopicBrazilCubaExercise TherapyReview Literature as TopicEvidence-Based MedicineDatabase Management SystemsSouth AfricaRecovery of FunctionMuscle StrengthLow Back PainTreatment OutcomeExerciseRural PopulationEthiopiaUrban PopulationCzechoslovakiaCross-Sectional StudiesPrevalenceSuburban HealthRural HealthUSSRSocioeconomic FactorsWater SupplyPersonnel DownsizingResidence CharacteristicsEnglandGreenlandRisk FactorsCivil DisordersSpace-Time ClusteringWalesJapanQuestionnairesCitiesDisease OutbreaksUrban HealthHousingEnvironmental ExposureAge FactorsMining