1. Department of Dermatology; Hospital de Clínicas de Porto Alegre; School of Medicine; University of Rio Grande do Sul; Porto Alegre RS Brazil
2. Department of Dermatology; Hospital das Clínicas de São Paulo; School of Medicine; University of São Paulo; São Paulo SP Brazil
3. Department of Dermatology; St George Hospital; School of Medicine; University of New South Wales; Sydney New South Wales Australia