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Heaton KM, el-Naggar A, Ensign LG, Ross MI, Balch CM.Heaton KM, et al. Among authors: ensign lg.Ann Surg. 1994 Feb;219(2):197-204. doi: 10.1097/00000658-199402000-00012.Ann Surg. 1994.PMID: 8129491Free PMC article.