1. 1University of Washington School of Medicine, Seattle, Washington;
2. 2Children’s National Heart Institute, Children’s National Hospital, Washington, District of Columbia;
3. 3Uganda Heart Institute, Mulago National Referral Hospital, Kampala, Uganda;
4. 4Dartmouth-Hitchock Medical Center, Lebanon, New Hampshire;
5. 5Division of Infectious Diseases, Children’s National Hospital, Washington, District of Columbia;
6. 6Cincinnati Children’s Hospital Medical Center, University of Cincinnati Medical School, Cincinnati, Ohio