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Olzowy, B.; Tsalemchuk, Y.; Schotten, K. J.; Reichel, O.; Harréus, U. (2011): Frequency of bilateral cervical metastases in oropharyngeal squamous cell carcinoma: A retrospective analysis of 352 cases after bilateral neck dissection. In: Head and Neck, Vol. 33, No. 2: pp. 239-243