1. European Centre for Disease Prevention and Control. Annual epidemiological report. Reporting on 2011 surveillance data and 2012 epidemic intelligence data. Sexually transmitted infections, including HIV and blood-borne viruses. Stockholm: The Centre; 2013.
2. World Health Organization. Global incidence and prevalence of selected curable sexually transmitted infections 2008. Geneva: The Organization; 2012.
3. Mucosal approaches in Neisseria vaccinology.;Pérez;Vaccimonitor,2009
4. The Norwegian Institute of Public Health [Smittevernboka]. Gonorrhea—guide for healthcare personnel [in Norwegian]. 2010 Feb 25; modified 2015 [cited 2015 Feb 6]. http://www.fhi.no/artikler/?id=82735
5. Træen B, Stigum H, Magnus P. Report from sexual surveys in 1987, 1992, 1997 and 2002 [in Norwegian]. Oslo: Norwegian Institute of Public Health; 2003.