This is a preview of subscription content,to check access. Authors and Affiliations Klinik für Hals-Nasen-Ohrenheilkunde, Kopf-Halschirurgie, Bundeswehrkrankenhaus Ulm, Oberer Eselsberg 40, 89081, Ulm, Deutschland K. J. Lorenz Corresponding author Correspondence toK. J. Lorenz. Ethics declarations ...