1. Clinical Biostatistics Unit; Hospital Universitario Ramón y Cajal (IRYCIS); Madrid Spain
2. Doctoral programme in Clinical Medicine and Public Health; Universidad de Granada; Granada Spain
3. Paediatric Dermatology Department; Hospital San Jose-Fundación Universitaria de Ciencias de la Salud-FUCS; Bogotá Colombia
4. Hospital Universitario Mayor-Méderi; Universidad del Rosario; Bogotá Colombia
5. Faculty of Medicine; Universidad Francisco de Vitoria; Madrid Spain
6. WHO Collaborating Centre for Global Women’s Health, Institute of Metabolism and Systems Research; University of Birmingham; Birmingham UK
7. Department of Dermatology; Hospital Universitario Ramón y Cajal; Madrid Spain
8. Department of Dermatology; Hospital San Jose-Fundación Universitaria de Ciencias de la Salud-FUCS; Bogotá Colombia
9. Preventive Medicine and Public Health Department; Hospital Universitario Ramón y Cajal, IRYCIS; Madrid Spain
10. c/o Cochrane Skin Group; The University of Nottingham; Nottingham UK
11. Institute of Metabolism and Systems Research; University of Birmingham; Birmingham UK
12. Clinical Biostatistics Unit; Hospital Universitario Ramón y Cajal (IRYCIS). CIBER Epidemiology and Public Health (CIBERESP); Madrid Spain
13. Cochrane Associate Centre of Madrid; Madrid Spain