Prevalence of Human Papillomavirus in Squamous Cell Carcinoma of the Head and Neck Determined by Polymerase Chain Reaction and Southern Blot Hybridization: Proposal for Optimized Diagnostic Requirements. - HOFFMANN, MARKUS; KAHN, TOMAS; MAHNKE, CHRISTOPH G.; GOEROEGH, TIBOR; LIPPERT, BURKARD M.; WERNER, JOCHEN A. (Acta Oto-Laryngologica, 1998)