1. Nutrition and Health Unit, Costa Rican Institute for Research and Education on Nutrition and Health (INCIENSA), Ministry of Health, Tres Ríos 4-2250, Costa Rica
2. Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA 02155, USA
3. Department of Global Health, Milken Institute School of Public Health, George Washington University, Washington, DC 20052, USA