1. Breastfeeding Clinical Unit Dr. Peset, University Hospital Dr. Peset, National Health Service, Valencia, Spain.
2. National Coordinator of Spain Baby-Friendly Initiative (IHAN-España Iniciativa para la Humanización de la Asistencia al Nacimiento y la Lactancia), Madrid, Spain.
3. Department of Medicine, Cambridge Health Alliance, Cambridge, Massachusetts.
4. Harvard Medical School, Boston, Massachusetts.
5. Department of Pediatrics, Ascension St. John, Detroit, Michigan.
6. Department of Family Medicine, University of Arizona, Tucson, Arizona.