1Hospers H J, Kok G, Harterink P, et al. A new meeting place: chatting on the Internet, e-dating and sexual risk behaviour among Dutch men who have sex with men. AIDS, 2005, 19 (10) : 1097-1101.
2Evans AR, Wiggins RD, Mercer CH, et al. Men who have sex with men in Great Britain: comparison of a self-selected intemet sample with a national probability sample. Sex Transm Infect, 2007, 83 (3) : 200-205.
3Elford J, Bolding G, Davis M, et al. Web-based behavioral surveillance among men who have sex with men: a comparison of online and offiine samples in London, UK. J Acquir Immune Defic Syndr, 2004,35 (4) : 421-426.