1. From the Stokes Research Institute and Departments of Pediatrics and Pharmacology (I.P., L.T., D.M.F., H.I.), Children’s Hospital of Philadelphia and The University of Pennsylvania, Philadelphia; the Department of Medicine (R.E.M., J.T., D.J.R.), The University of Pennsylvania, Philadelphia; the Department of Cardiovascular Medicine and Center for Cardiovascular Diagnostics and Prevention (X.F., S.L.H.), Cleveland Clinic Foundation, Cleveland Ohio; the Laboratory of Clinical Chemistry and Hematology...