1 Department of Government, Harvard University, Cambridge, MA, USA; Global Health and Health Policy, Harvard University, Cambridge, MA, USA.
2 Global Health and Health Policy, Harvard University, Cambridge, MA, USA; Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA.
3 Department of Endocrinology and Metabolism, Obesity and Eating Disorders Clinic, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (INCMNSZ), Tlalpan, Mexico City, Mexico.
4 Department of Medicine, Neuroendocrine Unit, Pediatric Endocrinology, Nutrition Obesity Research Center at Harvard, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA. Electronic address: fstanford@mgh.harvard.edu.