1. University of Pittsburgh Medical Center Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania;
2. School of Medicine and
3. Seattle Children’s Hospital, Seattle, Washington;
4. University of Washington, Seattle, Washington;
5. Harvard T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts;
6. Rady Children’s Hospital, San Diego, California; and
7. School of Medicine, University of California, San Diego, San Diego, California
8. Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania;