1. Department of Medical Information, University Hospital, 31059 Toulouse Cedex 9, France
2. UMR 1027, INSERM-University Paul Sabatier Toulouse III, 31073 Toulouse, France
3. Department of Epidemiology, Health Economics and Public Health, University Hospital, 31073 Toulouse, France
4. Department of Otolaryngology, University Hospital, 31059 Cedex 9 Toulouse, France