1. Department of Internal Medicine and Rheumatology; Justus-Liebig-University Gießen; Campus Kerckhoff Bad Nauheim Germany
2. Institute for Anatomy II: Experimental Morphology; University Hospital Hamburg-Eppendorf; Hamburg Germany
3. Department of Orthopaedic Surgery; Helios ENDO-Klinik Hamburg; Hamburg Germany
4. Department of Cardiac Surgery; Kerckhoff-Klinik; Bad Nauheim Germany
5. Department of Orthopedics and Trauma Surgery; Agaplesion Markus Hospital; Frankfurt Germany