1 Division of Dermatology, Department of Medicine, University of Toronto, Toronto, Canada.
2 Faculty of Medicine, University of Toronto, Toronto, Canada.
3 Michael G. DeGroote School of Medicine, McMaster University, Hamilton, Ontario, Canada.
4 Faculty of Dentistry, University of Toronto, Ontario, Canada.
5 Division of Dermatology, Department of Medicine, University of Toronto, Toronto, Canada; Division of Dermatology, Women's College Hospital, Toronto, Ontario, Canada; Probity Medical Research Inc, Waterloo, Ontario, Canada. Electronic address: jensen.yeung@utoronto.ca.