Lídia P. Almeida-Voumard, Faculty of Medicine, Agostinho Neto University, Luanda, Angola Cecília C. Almeida, National Directorate of Public Health, Ministry of Health, Luanda, Angola Ernesto Afonso, National Directorate of Public Health, Ministry of Health, Luanda, Angola Clarry N. Luvualu, National Directorate of Public Health, Ministry of Health, Luanda, Angola José M. Pedro, Provincial Health Delegation, Huambo, Angola Maiza R. Baptista, Dermatology Service, Américo Boavida Hospital, Luanda. Angola Pascoal O. Alberto, Dermatology Service, Américo Boavida Hospital, Luanda. Angola Juliano V. Isaías, Dermatology Service, Américo Boavida Hospital, Luanda. Angola Christian F. Voumard, National Directorate of Public Health, Ministry of Health, Luanda, Angola