Estimation of return-to-sports-time for athletes with stress fracture – an approach combining risk level of fracture site with severity based on imaging oleh Dobrindt Oliver, Hoffmeyer Birgit, Ruf Juri, Seidensticker Max, Steffen Ingo G, Fischbach Frank, Zarva Alina, Wieners Gero, Ulrich Gerhard, Lohmann Christoph H, Amthauer Holger