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UCL Royal Free & Univ Coll Med Sch, Dept Sexually Transmitted Dis, Mortimer Market Ctr, Hlth Advising Serv, London WC1E 6AU, England UCL Royal Free & Univ Coll Med Sch, Dept Sexually Transmitted Dis, Mortimer Market Ctr, Hlth Advising Serv, London WC1E 6AU, England