affiliation not provided to SSRN, Heidelberg Trauma Research Group, Department of Trauma and Reconstructive Surgery, Center for Orthopedics, Trauma Surgery and Spinal Cord Injury, Heidelberg University Hospital, Institute for Experimental Endocrinology, Charité –Universitätsmedizin Berlin, Freie Universität Berlin, Humboldt-Universität zu Berlin, Heidelberg Trauma Research Group, Department of Trauma and Reconstructive Surgery, Center for Orthopedics, Trauma Surgery and Spinal Cord Injury, Heidelberg University Hospital, Heidelberg Trauma Research Group, Department of Trauma and Reconstructive Surgery, Center for Orthopedics, Trauma Surgery and Spinal Cord Injury, Heidelberg University Hospital, BG Trauma Centre Ludwigshafen, Department of Physiotherapy, BG Trauma Centre Ludwigshafen, Department of Physiotherapy, Institute for Experimental Endocrinology, Charité –Universitätsmedizin Berlin, Freie Universität Berlin, Humboldt-Universität zu Berlin, Institute for Experimental Endocrinology, Charité –Universitätsmedizin Berlin, Freie Universität Berlin, Humboldt-Universität zu Berlin, Aschaffenburg Trauma and Orthopedic Research Group, Center for Orthopedics, Trauma Surgery and Sports Medicine, Hospital Aschaffenburg-Alzenau and BG Trauma Centre Ludwigshafen, Department of Paraplegiology