1. University of Groningen, University Medical Center Groningen Department of Otorhinolaryngology ‐ Head and Neck Surgery Groningen The Netherlands
2. Graduate School of Medical Sciences (Groningen University, Institute for Drug Exploration) Groningen The Netherlands
3. Department of Epidemiology University Medical Center Groningen, University of Groningen Groningen The Netherlands
4. University of Groningen, University Medical Center Groningen Department of Radiology Groningen The Netherlands