This is a rough list for the past 5 years of GI matches for Duke residents.
Duke x9, Pitt x2, Wake Forest x2, UTSW, Mayo, Vanderbilt, Penn, Cleveland Clinic
Historically, GI has not been as hotly pursued by Duke residents as it may be at some other top programs. If I recall correctly, 2 applied last year, 2 the year before, and 3 the year before that. It's simply resident preference, plus many choose Duke for its well-known cardiology program. On the other hand, those who applied to GI obviously matched well.