De-intensification of postoperative radiotherapy in head and neck cancer irrespective of human papillomavirus status—results of a prospective multicenter phase II trial (DIREKHT Trial) - Haderlein, Marlen P. (Verfasser); Nestle, Ursula (Verfasser); Mueller, Sarina K. (Verfasser); Fietkau, Rainer (Verfasser) (Universität, 2024)