B. Steinhilber, S. Hoffmann, K. Karlovic, S. Pfeffer, Th. Maier, O. Hallasheh, S. Kruck, R. Seibt, M.A. Rieger, M. Heidingsfeld, R. Feuer, O. Sawodny, R. Rothmund, and K.-D. Sievert. Development of an arm support system to improve ergonomics in laparoscopic surgery: study design and provisional results in Surgical Endoscopy. Surgical Endoscopy, (29):2851--2858, 2015. [PUMA: ISYS]