Development and evaluation of an EHR‐based computable phenotype for identification of pediatric Crohn's disease patients in a National Pediatric Learning Health System oleh Ritu Khare, Michael D. Kappelman, Charles Samson, Jennifer Pyrzanowski, Rahul A. Darwar, Christopher B. Forrest, Charles C. Bailey, Peter Margolis, Amanda Dempsey, And the PEDSnet Computable Phenotype Working Group