Anemia, Sickle CellSickle Cell TraitHemoglobin, SickleAntisickling AgentsFetal HemoglobinAnemiaErythrocytes, AbnormalHydroxyureaThalassemiaHemoglobin SC Diseasebeta-ThalassemiaHemoglobinsErythrocyte CountHemoglobin C DiseaseAnemia, HemolyticErythrocytesHemoglobinopathiesalpha-ThalassemiaGlobinsReticulocyte CountBlood TransfusionHemolysisHemoglobin CErythrocyte IndicesErythrocyte AgingHematocritHemoglobins, AbnormalErythrocyte DeformabilityErythrocyte InclusionsLeg UlcerReticulocytesBlood ViscosityNigeriaAnemia, AplasticExchange Transfusion, Whole BloodHemoglobin Agamma-GlobinsErythrocyte AggregationPriapismPainHemoglobinometryPremarital ExaminationsErythrocyte MembraneFanconi AnemiaHemoglobin A2EnuresisUltrasonography, Doppler, TranscranialReticulocytosisdelta-GlobinsCaricaErythrocyte TransfusionAnemia, Hemolytic, AutoimmuneOxygenbeta-GlobinsHomozygoteGlucosephosphate Dehydrogenase DeficiencyErythropoiesisHemoglobinuriaIron OverloadHemorheologyDiphosphoglyceric AcidsHemoglobin EAnemia, Hypochromic2,3-DiphosphoglycerateAnemia, MacrocyticAnemia, PerniciousCholelithiasisSplenic DiseasesOximetryProspective StudiesOxymetholoneBlood Grouping and CrossmatchingBlood Cell CountErythropoietinInfarctionIronVascular DiseasesStrokePrevalenceRisk FactorsHematologic TestsJamaicaAcute Chest SyndromeGlucosephosphate DehydrogenaseCross-Sectional StudiesRheology