Anemia, Sickle CellSickle Cell TraitHemoglobin, SickleAntisickling AgentsFetal HemoglobinAnemiaErythrocytes, AbnormalHydroxyureaThalassemiaHemoglobin SC Diseasebeta-ThalassemiaHemoglobinsErythrocyte CountHemoglobin C DiseaseAnemia, HemolyticErythrocytesHemoglobinopathiesalpha-ThalassemiaGlobinsReticulocyte CountBlood TransfusionHemoglobin CHemolysisErythrocyte IndicesErythrocyte AgingHematocritHemoglobins, AbnormalErythrocyte DeformabilityErythrocyte InclusionsReticulocytesLeg UlcerBlood ViscosityAnemia, AplasticExchange Transfusion, Whole BloodNigeriaHemoglobin Agamma-GlobinsErythrocyte AggregationPriapism