8Choi KH, Gibson DR, Han L, et al. High levels of unprotected sex with men and women mnong men who bave sex with men:a potential bridge of HIV transmission in Beijing, China[J].AIDS Educ Prey, 2004,16( 1 ) : 19-30.
9Tabei S, Sanchez J, Lama J, et al. HIV, syphilis and beterosexual bridging among Peruvian men who have sex whh men J. AIDS, 2002,16(9) : 1271-1277.
10Prabhu R, Owen CI., Folger K, et al. The bisexual bridge revis ited: sexual risk behavior among men who have sex with men and women, San Francisco, 1998 2003 [J]. AIDS, 2004, 18( 11 ) 1604-1606.