RT Journal Article SR Electronic T1 27 years of uninterrupted contact tracing. The 'Tyneside Scheme'. JF The British Journal of Venereal Diseases JO Br J Vener Dis FD BMJ Publishing Group Ltd SP 37 OP 50 DO 10.1136/sti.48.1.37 VO 48 IS 1 A1 Wigfield, A S YR 1972 UL http://sti.bmj.com/content/48/1/37.abstract AB