1Ormaeche M, Whittembury A, Pun M, et al. Hepatitis B virus, syphilis, and HIV seroprevalence in pregnant women and their male partners from six indigenous populations of the Peruvian Amazon Basin, 2007 - 2008. Int J Infect Dis, 2012,16(10) :e724 -730.
2Makasa M, Fylkesnes K, Michelo C, et al. Declining syphilis trends in concurrence with HIV declines among preg- nant women in Zambia: observations over 14 years of national surveillance. Sex Transm Dis,2012,39(3) :173 -181.