Randomized Controlled Trials: "It Ain't Necessarily So"
Grimes, David A.
OBSTETRICS AND GYNECOLOGY 1991 October; 78(4): 703-704
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Blinding and Exclusions After Allocation in Randomised Controlled Trials: Survey of Published Parallel Group Trials in Obstetrics and Gynaecology Schulz, Kenneth F.; Grimes, David A.; Altman, Douglas G.; Hayes, Richard J. (1996-03-23)