title: Changes of T-lymphocyte subsets in recurrent aphthous ulcers.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007958:Leukocyte Count; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D013281:Stomatitis, Aphthous / Q000209:etiology / Q000276:immunology*; D013601:T-Lymphocytes / Q000145:classification*