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A. R. Kreimer, G. M. Clifford, P. Boyle, S. Franceschi: Human papillomavirus types in head and neck squamous cell carcinomas worldwide: a systematic review. In: Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology. Band 14, Nummer 2, Februar 2005, S. 467–475, doi:10.1158/1055-9965.EPI-04-0551, PMID 15734974 (Review).