Anemia, Sickle CellSickle Cell TraitHemoglobin, SickleAntisickling AgentsFetal HemoglobinAnemiaErythrocytes, AbnormalHydroxyureaPrevalenceThalassemiaHemoglobin SC Diseasebeta-ThalassemiaHemoglobinsErythrocyte CountHemoglobin C DiseaseErythrocytesAnemia, HemolyticHemoglobinopathiesalpha-ThalassemiaGlobinsReticulocyte CountBlood TransfusionErythrocyte IndicesHemoglobin CHemolysisErythrocyte AgingHematocritHemoglobins, AbnormalErythrocyte DeformabilityErythrocyte InclusionsNigeriaLeg UlcerReticulocytesBlood ViscosityAnemia, AplasticExchange Transfusion, Whole BloodHemoglobin Agamma-GlobinsErythrocyte AggregationPriapismHemoglobinometryCross-Sectional StudiesPainRisk FactorsEnuresisPremarital ExaminationsFanconi AnemiaErythrocyte MembraneHemoglobin A2Ultrasonography, Doppler, TranscranialReticulocytosisdelta-GlobinsCaricaErythrocyte TransfusionOxygenAnemia, Hemolytic, AutoimmuneProspective Studiesbeta-GlobinsHomozygoteGlucosephosphate Dehydrogenase DeficiencyErythropoiesisIron OverloadAnemia, HypochromicHemoglobinuriaAge FactorsHemorheologyHemoglobin EChild WelfareDiphosphoglyceric Acids2,3-DiphosphoglycerateInfant, NewbornCholelithiasisOximetryAnemia, MacrocyticAnemia, PerniciousSplenic DiseasesIronJamaicaBlood Grouping and CrossmatchingOxymetholoneBlood Cell CountAfrican Continental Ancestry GroupGenotypeErythropoietinDisabled ChildrenRetrospective StudiesChild BehaviorInfarctionCase-Control StudiesVascular DiseasesAfricaHematologic TestsStrokeBrazilFollow-Up StudiesSaudi ArabiaAcute Chest SyndromeGlucosephosphate DehydrogenaseAcute DiseaseTime Factors