1. Division of Dermatology; McGill University; Montreal Quebec Canada
2. Division of Dermatology; University of Ottawa; Ottawa Ontario Canada
3. Division of Clinical Epidemiology; McGill University; Montreal Quebec Canada
4. Division of Dermatology; University of Montreal; Montreal Quebec Canada
5. Division of Dermatology; Laval University; Quebec City Quebec Canada
6. Division of Dermatology; University of Sherbrooke; Sherbrooke Quebec Canada