1. Department of Medicine, Cambridge Health Alliance, Cambridge, Massachusetts
2. Department of Medicine, Harvard Medical School, Boston, Massachusetts
3. Department of Obstetrics and Gynecology, Division of Maternal and Fetal Medicine, University of North Carolina School of Medicine, Chapel Hill, North Carolina
4. Division of Nutrition, Physical Activity, and Obesity, Centers for Disease Control and Prevention, Atlanta, Georgia
5. National Alliance for Breastfeeding Advocacy, Weston, Massachusetts