1. University of Ottawa, Ottawa Hospital Research Institute; Department of Otolaryngology - Head and Neck Surgery; 500 Smyth Road Ottawa Ontario Canada N4K7A2
2. Dalhousie University; Department of Pathology and Laboratory Medicine; 5788 University Avenue Halifax Nova Scotia Canada B3H 1V8
3. University of Ottawa; Endocrinology and Metabolism; Ottawa Ontario Canada
4. The Ottawa Hospital; Neurosurgery; 1053 Carling Avenue, Room C2118 Ottawa Ontario Canada K1Y 4E9
5. University of Ottawa; Department of Otolaryngology - Head and Neck Surgery; 132-737 Parkdale Avenue Ottawa ON Canada K1Y 1J8
6. Erasmus MC; Department of Epidemiology; PO Box 2040 Rotterdam Netherlands 3000 CA