1. LaKind Associates, LLC, Catonsville, Maryland.
2. Department of Pediatrics, The Milton S. Hershey Medical Center, Penn State College of Medicine, Hershey, Pennsylvania.
3. Department of Epidemiology and Preventative Medicine, University of Maryland School of Medicine, Baltimore, Maryland.
4. Obstetric and Pediatric Pharmacology Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, U.S. Department of Health and Human Services, Bethesda, Maryland.