1. Department of Pediatrics (Neonatal-Perinatal Medicine), University of Arkansas for Medical Sciences, Arkansas Children's Hospital, Little Rock, Arkansas
2. Division of Biostatistics, Penn State College of Medicine, Hershey, Pennsylvania
3. Department of Family Medicine, Lifelong Medicare Care, Richmond, California
4. Department of Pediatrics (Neonatal-Perinatal Medicine), University of Texas Southwestern Medical Center, Dallas, Texas
5. Departments of Pediatrics (Neonatal-Perinatal Medicine) and Obstetrics and Gynecology, Penn State Health Children's Hospital, Hershey, Pennsylvania