1. Centre for Academic Child Health, University of Bristol, Bristol, United Kingdom.
2. Infancy and Sleep Centre, Department of Anthropology, Durham University, Durham, United Kingdom.
3. Department of Anthropology, Santa Clara University, Santa Clara, California.
4. Mother-Baby Sleep Lab, Department of Anthropology, University of Notre Dame, South Bend, Indiana.
5. Department of Pediatrics, Division of Adolescent Medicine, Cooper Medical School of Rowan University, Camden, New Jersey.
6. Department of Pediatrics, University of Connecticut School of Medicine, Farmington, Connecticut.
7. Connecticut Children's Medical Center, Division of Neonatology, Hartford, Connecticut.
8. Department of Medicine, Cambridge Health Alliance and Harvard Medical School, Cambridge Massachusetts.