1. Department of Epidemiology, Public Health School, Faculty of Medicine, University of Chile, Santiago, Chile.
2. Research Circle on Plants with Effects on Health, Lima, Peru.
3. Department of Biological and Physiological Sciences, Faculty of Sciences and Philosophy, Universidad Peruana Cayetano Heredia, Lima, Peru.
4. Instituto de Investigaciones de la Altura, Universidad Peruana Cayetano Heredia, Lima, Peru.