1. Division of Pediatric Critical Care Medicine, Washington University in St. Louis School of Medicine St. Louis Children's Hospital St. Louis Missouri USA
2. Trauma and Transfusion Medicine Center, Department of Surgery, University of Pittsburgh School of Medicine Children's Hospital of Pittsburgh Pittsburgh Pennsylvania USA
3. Division of Emergency Medicine, Department of Pediatrics, Nationwide Children's Hospital The Ohio State University College of Medicine Columbus Ohio USA
4. Cancer and Blood Disorders Institute, Blood Bank and Transfusion Medicine Johns Hopkin All Children's Hospital Florida USA
5. Departments of Surgery, Epidemiology, and Clinical and Translational Science University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA
6. Department of Critical Care Medicine University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA