White blood cell disorders.
D002648:Child; D006801:Humans; D007223:Infant; D007962:Leukocytes; D007964:Leukocytosis; D007970:Leukopenia; D008218:Lymphocytosis
LEUKOCYTOSIS/in infancy and childhood; LEUKOPENIA/in infancy and childhood; LYMPHOCYTOSIS/in infancy and childhood