1. Department of Hospital-Based Medicine; Northwestern University; Children's Memorial Hospital; Chicago; Illinois; USA
2. Department of Anesthesiology; Dartmouth Hitchcock Medical Center; Lebanon; New Hampshire; USA
3. Department of Pediatric Critical Care; Children's Hospital at OU Medical Center; Oklahoma City; Oklahoma; USA
4. Department of Anesthesiology and Critical Care Medicine; Alfred I duPont Hospital for Children; Wilmington; Delaware; USA