1. Department for Trauma Hand and Reconstructive Surgery, University Hospital Münster, Albert-Schweitzer-Campus 1, Building W1, Waldeyerstraße 1, 48149 Münster, Germany
2. Department for Spine Surgery and Scoliosis, St. Franziskus-Hospital GmbH Münster, Hohenzollernring 70, 48145 Münster, Germany
3. Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Münster, Kardinal-von-Galen-Ring 10, 48149 Münster, Germany