1. Diabetes and Obesity Research Institute, Department of Biomedical Sciences, Cedars-Sinai Medical Center; Los Angeles California USA
2. Instituto de Medicina Tropical Daniel A. Carrión, Department of Preventive Medicine and Public Health, Universidad Nacional Mayor de San Marcos; Lima Peru
3. Department of Preventive Medicine and Public Health; Faculty of Medicine, Universidad Nacional Mayor de San Marcos; Lima Peru
4. Instituto Nacional de Biología Andina, Universidad Nacional Mayor de San Marcos; Lima Peru
5. Department of Biomathematics; University of California; Los Angeles (UCLA) California USA.