2 Department of Health Promotion, World Health Organization Africa Regional Office, Brazzaville, Republic of Congo.
3 Massachusetts General Hospital, MGH Weight Center, Department of Medicine-Division of Endocrinology-Neuroendocrine, Department of Pediatrics-Division of Endocrinology, Nutrition Obesity Research Center at Harvard (NORCH), Harvard Medical School, Boston, MA, USA. Electronic address: fstanford@mgh.harvard.edu.