1. Faculty of Science and Engineering, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
2. 4th Department of Surgery, Attikon University Hospital, Medical School, National and Kapodistrian University of Athens, Rimini 1, Chaidari, 12462 Athens, Greece
3. SLK Kliniken am Gesundbrunnen, Am Gesundbrunnen 20–26, 74078 Heilbronn, Germany
4. School of Social Studies, Hanze University of Applied Sciences, Zernikeplein 23, 9747 AS Groningen, The Netherlands