[1] Univ Toronto, Dept Med, Div Dermatol, Toronto, ON, Canada
[2] McMaster Univ, Michael G DeGroote Sch Med, Hamilton, ON, Canada
[3] Univ Toronto, Temerty Fac Med, Toronto, ON, Canada
[4] Geneva Univ Hosp, Div Dermatol & Venereol, Geneva, Switzerland
[5] Univ Toronto, Hosp Sick Children, Dept Paediat, Div Dermatol, Toronto, ON, Canada
[6] Univ British Columbia, Dept Dermatol & Skin Sci, Vancouver, BC, Canada
[7] Donovan Hair Clin, Whistler, BC, Canada