RT Journal Article SR Electronic T1 Oral contraception among special clinic patients. With particular reference to the diagnosis of gonorrhoea. JF The British Journal of Venereal Diseases JO Br J Vener Dis FD BMJ Publishing Group Ltd SP 106 OP 107 DO 10.1136/sti.46.2.106 VO 46 IS 2 A1 A B Hewitt YR 1970 UL http://sti.bmj.com/content/46/2/106.abstract AB