title: Introduction and summary tables.
authors.affiliation: Whittall Street Clinic, Whittall Street, Birmingham B4 6DH, UK. jonathan.ross@hobtpct.nhs.uk
authors.forename: J D C
authors.initials: JD
authors.lastname: Ross
authors.forename: C A
authors.initials: CA
authors.lastname: Ison
mesh_terms: D001681:Biological Assay / Q000379:methods; D005260:Female; D020010:Heterosexuality; D006716:Homosexuality; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000379:methods*; D008828:Microbiological Techniques; D012749:Sexually Transmitted Diseases / Q000175:diagnosis*