title: Frequency of twinning in paediatric HIV infection.
authors.forename: T
authors.initials: T
authors.lastname: Frederick
authors.forename: L
authors.initials: L
authors.lastname: Mascola
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology / Q000635:transmission*; D000328:Adult; D002140:California / Q000453:epidemiology; D002648:Child; D005192:Family Health; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D015819:Substance Abuse, Intravenous / Q000150:complications; D014427:Twins / Q000706:statistics & numerical data*