Comparison of descriptions of allocation concealment in trial protocols and the published reports: cohort study.
Pildal, Julie; Chan, An-Wen; Hrobjartsson, Asbjorn; Forfang, Elisabeth; Altman, Douglas G.; Gotzsche, Peter C.; BMJ: British Medical Journal (International Edition), 2005, vol. 330, issue 7499, p 1049, ISSN 09598146. ISBN 17561833.

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