1. Methodist Children’s Hospital, San Antonio. TX, USA
2. Duke University Medical Center, Durham, NC, USA
3. University of Louisville, Louisville, KY, USA
4. The Christ Hospital, Cincinnati, OH, USA
5. Joe Dimaggio Children’s Hospital, Hollywood, FL, USA
6. West Virginia University, Morgantown, WV, USA
7. Children’s Hospital of Philadelphia, Philadelphia, PA, USA
8. University of Michigan, Ann Arbor, MI, USA