Improvement of cost allocation in gastroenterology by introduction of a novel service catalogue covering the complete spectrum of endoscopic procedures - Rathmayer, M; Scheffer, H; Braun, M; Heinlein, W; Akoglu, B; Brechmann, T; Gölder, S K; Lankisch, T; Messmann, H; Schneider, A; Wagner, M; Fleßa, S; Meier, A; Lewerenz, B; Gossner, L; Faiss, S; Toermer, T; Werner, T; Wilke, M H; Lerch, M M; Schepp, WDRG-Arbeitsgruppe und das Zeiterfassungsprojekt der DGVS (Autoren im Anhang) (Z Gastroenterol, 2015)