1. Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania.
2. Department of Anesthesiology and Critical Care Medicine, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
3. Department of Pathology, University of Edinburgh, Edinburgh, United Kingdom.
4. Department of Biostatistics and Epidemiology, University of Pennsylvania, Philadelphia, Pennsylvania.
5. Department of Military and Emergency Medicine, Uniformed Services University, Bethesda, Maryland.