PO-104 Predictors for an improved survival in surgically treated patients - Risk stratification in OPSCC. (March 2019) - Würdemann, N.; Wagner, S.; Wittekindt, C.; Sharma, S.J.; Reuschenbach, M.; Prigge, E.; Von Knebel-Doeberitz, M.; Gattenlöhner, S.; Burkhardt, E.; Pons-Kühnemann, J.; Klußmann, J.P.