Lise L. Kjaergard, Sarah L. Frederiksen, Christian Gluud 

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Validity of randomized clinical trials in gastroenterology from 1964–2000  Lise L. Kjaergard, Sarah L. Frederiksen, Christian Gluud  Gastroenterology  Volume 122, Issue 4, Pages 1157-1160 (April 2002) DOI: 10.1053/gast.2002.32390 Copyright © 2002 American Gastroenterological Association Terms and Conditions

Fig. 1 Mean proportion of trials (standard error of the mean) with adequate allocation concealment from 1964 to 2000 in 9-year intervals and from 1991 to 2000. Gastroenterology 2002 122, 1157-1160DOI: (10.1053/gast.2002.32390) Copyright © 2002 American Gastroenterological Association Terms and Conditions

Fig. 2 Mean number of patients per intervention arm (standard error of the mean) in randomized trials from 1964 to 2000 in 9-year intervals. Gastroenterology 2002 122, 1157-1160DOI: (10.1053/gast.2002.32390) Copyright © 2002 American Gastroenterological Association Terms and Conditions

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