Anemia, HypochromicAnemiaErythrocyte CountIronalpha-GlobinsAnemia, RefractoryHemoglobinsAnemia, Sideroblasticalpha-ThalassemiaErythropoietinAnemia, Iron-DeficiencyErythrocyte IndicesAnemia, AplasticFerritinsbeta-ThalassemiaErythropoiesisAnemia, HemolyticProtoporphyrinsTransferrinReticulocytesErythrocytes, AbnormalFanconi AnemiaThalassemiaHemoglobin HErythrocytesAnemia, Hemolytic, AutoimmuneHepcidinsReceptors, TransferrinAnemia, MacrocyticAnemia, PerniciousRenal DialysisAnemia, Sickle CellAnemia, MegaloblasticInfectious Anemia Virus, EquineAnemia, Hemolytic, CongenitalRecombinant ProteinsEquine Infectious AnemiaChicken anemia virusAnemia, Dyserythropoietic, CongenitalAnemia, Diamond-BlackfanFanconi Anemia Complementation Group ProteinsSymptom AssessmentDepressionTreatment OutcomePregnancy Complications, HematologicSeverity of Illness IndexAnemia, NeonatalPrevalenceHematinicsAnemia, Refractory, with Excess of BlastsHematocritFanconi Anemia Complementation Group C ProteinFanconi Anemia Complementation Group D2 ProteinFanconi Anemia Complementation Group A ProteinQuestionnairesRisk FactorsProspective StudiesPallor