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Bagley DH, Felix EL, Sindelar WF, et al. Barium enema, proctosigmoidoscopy and upper gastrointestinal series in the preoperative evaluation of the cancer patient. Cancer. 1977;39(4):1743-7doi: 10.1002/1097-0142(197704)39:4<1743::aid-cncr2820390454>3.0.co;2-2.
Bagley, D. H., Felix, E. L., Sindelar, W. F., Doppman, J. L., & Ketcham, A. S. (1977). Barium enema, proctosigmoidoscopy and upper gastrointestinal series in the preoperative evaluation of the cancer patient. Cancer, 39(4), 1743-7. https://doi.org/10.1002/1097-0142(197704)39:4<1743::aid-cncr2820390454>3.0.co;2-2
Bagley, D H, et al. "Barium enema, proctosigmoidoscopy and upper gastrointestinal series in the preoperative evaluation of the cancer patient." Cancer vol. 39,4 (1977): 1743-7. doi: https://doi.org/10.1002/1097-0142(197704)39:4<1743::aid-cncr2820390454>3.0.co;2-2
Bagley DH, Felix EL, Sindelar WF, Doppman JL, Ketcham AS. Barium enema, proctosigmoidoscopy and upper gastrointestinal series in the preoperative evaluation of the cancer patient. Cancer. 1977 Apr;39(4):1743-7. doi: 10.1002/1097-0142(197704)39:4<1743::aid-cncr2820390454>3.0.co;2-2. PMID: 856453.
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