Comparison of descriptions of allocation concealment in trial protocols and the published reports: cohort study.
Pildal J; Chan AW; Hróbjartsson A; Forfang E; Altman DG; Gøtzsche PC; BMJ (Clinical Research Ed.), 2005, vol. 330, issue 7499, p 1049, ISSN 17561833. ISBN 17561833.

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