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Prior notification of trial participants by newsletter increased response rates: a randomized controlled trial
Mitchell, Natasha, Hewitt, Catherine E., Lenaghan, Elizabeth, Platt, Eleanor, Shepstone, Lee, Torgerson, David J.Volume:
65
Language:
english
Journal:
Journal of Clinical Epidemiology
DOI:
10.1016/j.jclinepi.2012.05.008
Date:
December, 2012
File:
PDF, 142 KB
english, 2012