Dr . Edward D. Miller , dean of the medical faculty and CEO of Johns Hopkins Medicine , said that Yardley was `` one of the founding fathers of the field of gastrointestinal pathology , '' adding that he made `` groundbreaking observations on Whipple 's disease of the gastrointestinal tract and helped define the current classification system for neoplastic dysplasia in the colon and esophagus . ''
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