1. Department of Pediatrics, University of California Davis Medical Center, Sacramento, California.
2. Center for Healthcare Policy and Research, University of California Davis Medical Center, Sacramento, California.
3. Program in International and Community Nutrition, University of California Davis, Davis, California.
4. Department of Family Medicine and Community Health, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin.
5. Carolina Global Breastfeeding Institute, Department of Maternal and Child Health, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina.