1. Department of Clinical Epidemiology and Biostatistics; Pontificia Universidad Javeriana; Bogota Colombia
2. Department of Dermatology; Hospital Militar Central de Colombia; Bogota Colombia
3. Grupo de Estudio Genético de Enfermedades Complejas, Universidad Autónoma de Bucaramanga; Colombia
4. Nuffield Department of Population Health; University of Oxford; United Kingdom