CRONICAS Center of Excellence in Chronic Diseases, Universidad Peruana Cayetano Heredia, Armendáriz 497, Miraflores, Lima, 18, Peru Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK School of Public Health and Administration, Universidad Peruana Cayetano Heredia, Lima, Peru Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA School of Medicine, Universidad Peruana Cayetano Heredia, Lima, Peru