1 Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
2 Department of Biomedical and Health Informatics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
3 National Center for Human Factors in Healthcare, MedStar Health Research Institute, MedStar Health, Washington, District of Columbia; and raj.m.ratwani@medstar.net.
4 Department of Emergency Medicine, School of Medicine, Georgetown University, Washington, District of Columbia.