1. Department of Otorhinolaryngology, GZA Ziekenhuizen Campus Sint-Vincentius, Antwerp, Belgium
2. NKO, University Hospital Antwerp, Edegem, Antwerp, Belgium
3. Center of Statistics, University of Antwerp, StatUa, Antwerp, Belgium
4. Department of Otorhinolaryngology, University of Antwerp Faculty of Medicine and Health Sciences, Wilrijk, Antwerp, Belgium