1. Division of Dermatology, Department of Medicine, Sunnybrook Health Science Center and the University of Toronto, Toronto, Canada,
2. Division of Dermatology, Department of Medicine, Toronto Western Hospital and the University of Toronto, Toronto, Canada,
3. Division of Dermatology, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada,
4. Pasadena CA, U.S.A.,
5. Braddock Dermatology Clinic, Omaha, NB, U.S.A.,
6. Burlingame CA, U.S.A.,
7. Las Vegas Skin and Cancer Clinics, Las Vegas, NV, U.S.A.,
8. Divisions of Dermatology and Clinical Pharmacology, Department of Medicine and Pharmacology, Sunnybrook Health Science Center and the University of Toronto, Toronto, Canada