1. Department of Otorhinolaryngology, Head and Neck Surgery Kantonsspital Aarau Aarau Switzerland
2. Department of Surgery, The University of Melbourne The Royal Victorian Eye and Ear Hospital East Melbourne VIC Australia
3. HNO‐Zentrum Nordwest Muttenz Switzerland
4. Department of Gastroenterology and Hepatology University Medical Clinic, Kantonsspital Baselland Liestal Switzerland