1. Syphilis in the Modern Era
2. Centers for Disease Control and Prevention.Sexually transmitted diseases surveillance 2017;https://www.cdc.gov/std/stats17/syphilis.htm(accessed February 22 2019).
3. Effect of HIV infection on the course of syphilis;Pialoux G;AIDS Rev,2008
4. Cardiovascular syphilis in HIV infection: a case‐control study at the Institute of Sexually Transmitted Diseases, Chennai, India;Maharajan M;SexTransm Infect,2005
5. Increase in Primary and Secondary Syphilis Notifications in Men in Tokyo, 2007–2013