1. Division of Dermatology, Department of Internal Medicine, McMaster University, Faculty of Health Sciences and St. Joseph's Hospital, Hamilton, Ontario, Canada
2. Division of Dermatology, Department of Internal Medicine, University of Western Ontario, London, Ontario, Canada
3. Division of Dermatology, Department of Internal Medicine, St Catharines General Hospital and Hotel-Dieu Hospital, St Catharines, Ontario, Canada
4. Division of Dermatology, Department of Internal Medicine, University of Alberta, Edmonton, Alberta, Canada
5. Medical Department, AstraZeneca, Mississauga, Ontario, Canada