Anemia, MegaloblasticAnemia, MacrocyticVitamin B 12 DeficiencyFolic Acid DeficiencyAnemiaMegaloblastsAnemia, PerniciousVitamin B 12ThiamineFIGLU TestHydroxocobalaminIntrinsic FactorFolic AcidAnemia, HypochromicPregnancy Complications, HematologicHomocystinuriaDeoxyuridineBone Marrow Examination5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseAnemia, AplasticMalabsorption SyndromesVitamin B ComplexDiphyllobothriasisSchilling TestAnemia, HemolyticTranscobalaminsPancytopeniaHearing Loss, SensorineuralFanconi AnemiaBlood Group AntigensErythropoiesisAnemia, Hemolytic, AutoimmuneMethylmalonic AcidConsanguinityMembrane Transport ProteinsBone MarrowErythrocytesBlood