Systematic review to determine whether participation in a trial influences outcome.
Vist, Gunn Elisabeth; Birger Hagen, Kåre; Devereaux, P.J.; Bryant, Dianne; Tove Kristoffersen, Doris; Oxman, Andrew David; BMJ: British Medical Journal (International Edition), 2005, vol. 330, issue 7501, p 1175, ISSN 09598146. ISBN 17561833.

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