title: T lymphocyte subsets in parenteral and non-parenteral heroin abusers in Britain.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000276:immunology*; D000328:Adult; D005260:Female; D006556:Heroin Dependence / Q000276:immunology*; D006801:Humans; D007958:Leukocyte Count; D008297:Male; D013601:T-Lymphocytes