4Pale ID,Gillespie B,Foxman B. Sexual behavior of older womenresults of a random-digit-dialing survey of 2000 women in the U- nited States [J]. Sex Transn Dis,2003,30(20) :216.
5George PS, Brain GW,Jesus MG,et al. The unexplored story of HIV and ageing[J]. Bullentin of the World Health Organization, 2009,87(3) :161-244.
6Cohen MS, Hoffman IF, Royce RA, et al. Reduction of concen- tration of HIV-1 in semen after treatment of Urethritis:impliea- tion of HIV-I[J]. Lancet,1997,349 : 1868-1873.
7Ofarrell N,Sanop,sopheap S,et al. Changes in STI services fol- lowing a community based STI-intervention project in Cambodia [J].Southeast Asian J Trop Med Public Health, 2008,39 (5) : 867-875.