Impact of quality certification of multidisciplinary head and neck tumor centers. - Modabber, Ali; Schick, Daniel; Goloborodko, Evgeny; Peters, Florian; Heitzer, Marius; Bock, Anna; Kniha, Kristian; Hölzle, Frank; Schreiber, Elke M.; Möhlhenrich, Stephan Christian (Cost Effectiveness & Resource Allocation, 2021)