1. Department of Head and Neck Surgery, Hospices Civils de Lyon; University Hospital Lyon-Nord; Lyon France
2. Department of Head and Neck Surgery; University Hospital Carémeau; Nîmes France
3. Department of Head and Neck Surgery; University Hospital Dupuytren; Limoges France
4. Department of Head and Neck Surgery; University Hospital Bretonneau; Tours France
5. Department of Head and Neck Surgery; University Hospital Larrey; Toulouse France
6. Department of Head and Neck Surgery; University Hospital Pellegrin; Bordeaux France
7. Department of Head and Neck Surgery; Nantes University Hospital; Nantes France