Occurrence of cervical lymph node metastasis of maxillary squamous cell carcinoma: a monocentric study of 171 patients - Berger, Moritz; Saure, Daniel; Ristow, Oliver; Thiele, Oliver C.; Hofele, Christof; Hoffmann, Jürgen; Seeberger, Robin; Freier, Kolja (Journal of cranio-maxillofacial surgery, 2015)