<qa>  What was the name of the workshop sponsored by the NIH The American DigestProposed Study will Fill Significant Gaps in Knowledge. In the recent NIH PRG on stomach and esophageal cancers May 2002 and a workshop sponsored by the NIH The American Digestive Health Foundation on endoscopic priorities 44, experts in the field acknowledged that there was a need for multi-center, longitudinal, studies and there were significant gaps in the knowledge base of BE including: 