1 Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel, Brussels Health Campus, Brussel, Belgium.
2 MED-EL GmbH, Innsbruck, Austria.
3 Department of Otolaryngology and Head & Neck Surgery, Vrije Universiteit Brussel, University Hospital UZ Brussel, Brussels Health Campus, Brussel, Belgium.
4 Greenham Research Consulting Ltd., Oxfordshire, UK.