1. Penn State College of Medicine, Hershey, PA
2. Drexel University College of Medicine, Philadelphia, PA
3. Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Penn State College of Medicine, Hershey, PA
4. College of Medicine, University of Kentucky, Lexington, KY
5. Family and Community Medicine, The Arizona University College of Medicine, Tucson, AZ