Impact of Length or Relevance of Questionnaires on Attrition in Online Trials: Randomized Controlled Trial
Jim McCambridge(University College Dublin), Paul Wallace(Harvard University), Eleftheria Kalaitzaki(University College London), Ian R. White(MRC Clinical Trials Unit at UCL), Elizabeth Murray(University College London), Christine Godfrey(University of York), Zarnie Khadjesari(King's College London), Simon G. Thompson(MRC Biostatistics Unit), Stuart Linke(Camden and Islington NHS Foundation Trust)
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