1. History of syphilis;Rothschild;Clin Infect Dis,2005
2. The impact of syphilis on humankind;Tramont;Infect Dis Clin North Am,2004
3. Epidemiology of syphilis in the United States, 1941-1993;Nakashima;Sex Transm Dis,1996
4. Public Health Agency. 2004 Canadian sexually transmitted infections surveillance report. Canada: Public Health Agency; 2007.
5. Health Protection Agency. Mapping the issues. HIV and other sexually transmitted infections in the United Kingdom: 2005. London: Health Protection Agency; 2005.