1. Centers for Disease Control and Prevention Sexually transmitted disease surveillance, 2012 Department of Health and Human Services Atlanta, GA 2013
2. European Centre for Disease Prevention and Control Annual Epidemiological Report 2013. Reporting on 2011 surveillance data and 2012 epidemic intelligence data ECDC Stockholm 2013
3. Centers for Disease Control and Prevention Sexually Transmitted Diseases Treatment Guidelines, 2010
4. European Centre for Disease Prevention and Control Annual Epidemiological Report 2012. Reporting on 2010 surveillance data and 2011 epidemic intelligence data ECDC Stockholm 2013