[1] Univ Alberta, Dept Med, Div Dermatol, Edmonton, AB, Canada
[2] Minist Hlth, Syrian Arab Red Crescent Hosp, Dept Dermatol & Venereol, Damascus, Syria
[3] Univ Alberta, Sperber Hlth Sci Lib, Edmonton, AB, Canada
[4] Univ Alberta, Div Dermatol, 8-112 Clin Sci Bldg, Edmonton, AB T6G 2G3, Canada