title: Letter: Decrease of T lymphocytes during ageing.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000375:Aging; D001402:B-Lymphocytes / Q000276:immunology; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007111:Immunity, Cellular; D007958:Leukocyte Count; D008875:Middle Aged; D009369:Neoplasms / Q000453:epidemiology / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*