[1] Newcastle Gen Hosp, Dept Infect & Trop Med, Newcastle Upon Tyne NE4 6BE, Tyne & Wear, England
[2] Contracept & Sexual Hlth Serv, Blyth, England
[3] Sunderland Royal Hosp, Sunderland, England
[4] Royal Victoria Infirm, Cytol Lab, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England
[5] Queen Elizabeth Hosp Fdn Trust, Cytol Lab, Gateshead, England