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Scharer LL, Burhenne HJ (April 1964). "Megacolon associated with administration of an anticholinergic drug in a patient with ulcerative colitis". The American Journal of Digestive Diseases. 9 (4): 268–274. doi:10.1007/bf02232133. PMID14142388. S2CID19169565.
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Scharer LL, Burhenne HJ (April 1964). "Megacolon associated with administration of an anticholinergic drug in a patient with ulcerative colitis". The American Journal of Digestive Diseases. 9 (4): 268–274. doi:10.1007/bf02232133. PMID14142388. S2CID19169565.