[1] Univ Calgary, Cumming Sch Med, Calgary, AB, Canada
[2] Univ Ottawa, Fac Med, Ottawa, ON, Canada
[3] Univ Calgary, Div Dermatol, Calgary, AB, Canada
[4] Beacon Dermatol, Calgary, AB, Canada
[5] Zealand Univ Hosp, Dept Dermatol, Roskilde, Denmark
[6] Univ Copenhagen, Fac Hlth & Med Sci, Dept Clin Med, Copenhagen, Denmark
[7] Deventer Hosp, Dept Dermatol, Deventer, Netherlands