1. Received April 3, 2021 from Department of Trauma and Orthopedic Surgery, University Medical Center, Hamburg, Germany (JB-G, JMR, K-HF, MH); Department of Neurosurgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (PC); Institute for Research in Operative Medicine (IFOM), University of Witten/Herdecke, Cologne-Merheim Medical Center (CMMC), Cologne, Germany (RL); Department of Orthopaedic and Trauma Surgery, Asklepios St. Georg, Hamburg, Germany (MH). Revised received June 11, 2021;...