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Practitioner 1973, 210:259\u2013263. Pregnant women were randomly assigned to treatment with senna, dioctyl sodium succinate, sterculia plus frangula, or sterculia. Senna was more effective than the bulking agents but were more likely to cause diarrhea and abdominal pain.","journal-title":"Practitioner"},{"key":"57_CR2","doi-asserted-by":"crossref","first-page":"216","DOI":"10.1159\/000197122","volume":"4","author":"N Levy","year":"1971","unstructured":"Levy N, Lemberg E, Sharf M: Bowel habit in pregnancy. Digestion 1971, 4:216\u2013222.","journal-title":"Digestion"},{"key":"57_CR3","doi-asserted-by":"crossref","first-page":"1941","DOI":"10.1016\/0016-5085(85)90023-X","volume":"88","author":"RC Gill","year":"1985","unstructured":"Gill RC, Bowes KL, Kingma YJ: Effect of progesterone on canine colonic smooth muscle. 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Transit was correlated with serum progesterone, showing an increase in transit as progesterone increased to 80 ng\/mL. No further increase was seen with levels from 80 to 230 ng\/mL, suggesting a threshold effect for the progesterone level.","journal-title":"Gastroenterology"},{"key":"57_CR8","first-page":"202","volume":"39","author":"AS Anderson","year":"1985","unstructured":"Anderson AS, Whichelow MJ: Constipation during pregnancy: dietary fibre intake and the effect of fibre supplementation. Hum Nutr Appl Nutr 1985, 39:202\u2013207. Forty pregnant women with constipation were randomly assigned to a corn-based fiber, wheat-bran fiber, or control for 2 weeks. Both types of fiber were effective in increasing stool frequency.","journal-title":"Hum Nutr Appl Nutr"},{"key":"57_CR9","doi-asserted-by":"crossref","first-page":"993","DOI":"10.1016\/S0002-8223(02)90228-2","volume":"102","author":"JA Marlett","year":"2002","unstructured":"Marlett JA, McBurney MI, Slavin JL: Position of the American Dietetic Association: health implications of dietary fiber. J Am Diet Assoc 2002, 102:993\u20131000.","journal-title":"J Am Diet Assoc"},{"key":"57_CR10","doi-asserted-by":"crossref","first-page":"549","DOI":"10.1016\/S0002-8223(02)90127-6","volume":"102","author":"AJ McEligot","year":"2002","unstructured":"McEligot AJ, Gilpin EA, Rock CL, et al.: High dietary fiber consumption is not associated with gastrointestinal discomfort in a diet intervention trial. 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