University of Pennsylvania, University of Pennsylvania, University of Pennsylvania, University of Pennsylvania, University of Pennsylvania, University of Pennsylvania, University of Pennsylvania, University of Pennsylvania, Nationwide Children's Hospital - Abigail Wexner Research Institute, Northwestern University, New York University (NYU), Vanderbilt University, University of Colorado, Aurora, University of Michigan at Ann Arbor, Columbia University, University of Pennsylvania, University of Pennsylvania - Children's Hospital of Philadelphia, University of Pennsylvania and Independent