1 Trauma Surgery Department, Experimental Trauma Surgery-Laboratory for Musculoskeletal Trauma and Regenerative Therapies, Hannover Medical School (MHH), Carl-Neuberg-Str.1, 30625 Hannover, Germany.
2 IRCCS Istituto Ortopedico Rizzoli, Complex Structure Surgical and Technological Sciences, Via di Barbiano, 1/10, 40136 Bologna, Italy.
3 Department of Trauma Surgery, Center for Clinical Research, University Hospital Zurich, University of Zurich, Sternwartstrasse 14, CH-8091 Zurich, Switzerland.