1 University of Colorado, Pediatrics , Aurora, Colorado, United States; dliptzin@yahoo.com.
2 University of Colorado School of Medicine, 12225, Pediatrics , Aurora, Colorado, United States.
3 University of Washington, 7284, Pediatrics, Seattle, Washington, United States.
4 University of Colorado Anschutz Medical Campus School of Medicine, 12225, Pediatrics, Aurora, Colorado, United States.
5 National Institute of Allergy and Infectious Diseases, 35037, Bethesda, Maryland, United States.
6 University of Colorado Anschutz Medical Campus School of Medicine, 12225, Department of Pathology and Laboratory Medicine , Aurora, Colorado, United States.
7 University of Washington, 7284, Pathology, Seattle, Washington, United States.
8 Children's Hospital Colorado, 2932, Radiology, Aurora, Colorado, United States.