Affiliation: | (1) Department of Oto-Rhino-Laryngology, Head and Neck Surgery, Ernst-Moritz-Arndt University, Walther-Rathenau-Street 43-45, 17487 Greifswald, Germany;(2) Department of Oto-Rhino-Laryngology, Head and Neck Surgery, University of Würzburg, Würzburg, Germany;(3) Institute of Community Medicine, Section Epidemiology of Health Care and Community Health, Ernst-Moritz-Arndt University, Greifswald, Germany |