1. Dermatological Center, "Dr. Ladislao de la Pascua"; Education and Research Unit; Dr. José María Vértiz No. 464 Col. Buenos Aires México City Mexico 06780
2. Hofstra Northwell School of Medicine; Department of Dermatology; Hempstead New York USA
3. Hospital Infantil de México Federico Gómez (HIMFG), Health National Institute; Evidence-Based Medicine Research Unit; Dr. Márquez #162 Col. Doctores, Del. Cuauhtémoc México City Mexico 06720
4. Iberoamerican Cochrane Network; Institute of Biomedical Research (IIB Sant Pau), C/ Sant Antoni Ma Claret 171 Casa de Convalescència Barcelona Barcelona Spain 08041