1 Department of Orthopaedic, Trauma and Reconstructive Surgery, Charité Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany.
2 Department of Orthopaedic, Trauma and Reconstructive Surgery, Charité Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany.; Department of Anatomy, Paracelsus Medical University, Salzburg and Nuremberg, Nuremberg, Germany.