Cite
HARVARD Citation
Welton, A. et al. (1999). Is recruitment more difficult with a placebo arm in randomised controlled trials? A quasirandomised, interview based study. BMJ. 318 (7191), pp. 1114-1117. [Online].
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Welton, A. et al. (1999). Is recruitment more difficult with a placebo arm in randomised controlled trials? A quasirandomised, interview based study. BMJ. 318 (7191), pp. 1114-1117. [Online].