1. Division of Dermatology University of Ottawa Ottawa Ontario Canada
2. Department of Medicine McGill University Montréal Québec Canada
3. Division of Dermatology McGill University Montréal Québec Canada
4. Division of Clinical Epidemiology McGill University Montréal Québec Canada
5. Ottawa Hospital Research Institute Ottawa Ontario Canada
6. Division of Hematology McGill University Montréal Québec Canada