1. Division of Emergency Medicine, Children's Hospital of Philadelphia; Philadelphia Pennsylvania USA
2. Perelman School of Medicine; University of Pennsylvania; Philadelphia Pennsylvania USA
3. US Military HIV Research Program; Bethesda Maryland USA
4. Department of Emergency Medicine, Hospital of the University of Pennsylvania; Philadelphia Pennsylvania USA
5. Department of Emergency Medicine, University of Colorado; Denver Colorado USA
6. State University of New York Upstate Medical University; Syracuse New York USA
7. Ashland Community Hospital; Ashland Oregon USA
8. Department of Emergency Medicine, Brigham and Women's Hospital; Boston Massachusetts USA