Relevance of the time interval between surgery and adjuvant radio (chemo) therapy in HPV-negative and advanced head and neck carcinoma of unknown primary (CUP) - Balk, Matthias 1986-; Rupp, Robin 1989-; Mantsopoulos, Konstantinos 1979-; Allner, Moritz; Grundtner, Philipp; Mueller, SK; Traxdorf, Maximilian; Eckstein, Markus; Speer, Stefan; Semrau, Sabine; Fietkau, Rainer; Iro, Heinrich; et al. (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2021)