1. Centers for disease control and prevention. CDC—Global Cancer Statistics. Int Cancer Control 2012. http://www.cdc.gov/cancer/international/statistics.htm (accessed 18 August 2016).
2. The cancer burden attributable to biologic agents;D Schottenfeld;Ann Epidemiol,2015
3. WHO | Human papillomavirus (HPV) and cervical cancer,2016
4. Human papillomavirus vaccines in plants;C Giorgi;Expert Rev Vaccines,2010
5. Papillomaviruses and cancer: from basic studies to clinical application;H Zur Hausen;Nat Rev Cancer,2002