RT Journal Article SR Electronic T1 Hong Kong Social Hygiene Service JF The British Journal of Venereal Diseases JO Br J Vener Dis FD BMJ Publishing Group Ltd SP 82 OP 85 DO 10.1136/sti.32.2.82 VO 32 IS 2 A1 G. M. Thomson YR 1956 UL http://sti.bmj.com/content/32/2/82.abstract AB