The frequency of specialized intestinal metaplasia at the squamo-columnar junction varies with the extent of columnar epithelium lining the esophagus: S.J. Spechler, J.M. Zeroogian, H.H. Wang, D.A. Antonioli, R.K. Goyal. Center for Swallowing Disorders and Dept. of Pathology, Beth Israel Hospital, Harvard Medical School, Boston, MA