1. Department of Otolaryngology Head & Neck Surgery, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain, 10 Avenue Hippocrate, 1200 Brussels, Belgium
2. Department of Otolaryngology Head & Neck Surgery, Ninewells Hospital, University of Dundee, Dundee DD1 4HN, UK
3. Department of Emergency Medicine, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain and Hôpital National des Forces Armées, Brussels, Belgium