1. Connecticut Human Milk Research Center, Division of Neonatology, Connecticut Children's Medical Center, Hartford, Connecticut.
2. Department of Public Health Sciences, University of Rochester, Rochester, New York.
3. Department of Pediatrics, Rochester General Hospital, Rochester, New York.
4. Department of Clinical Sciences, Temple University School of Medicine, Philadelphia, Pennsylvania.
5. Department of Pediatrics, University of Rochester, Rochester, New York.