Published on 18.11.2011 in Vol 13, No 4 (2011): Oct-Dec

This is a member publication of e-Health Unit, UCL PCPH, Royal Free Campus, London, United Kingdom

Impact of Length or Relevance of Questionnaires on Attrition in Online Trials: Randomized Controlled Trial

Impact of Length or Relevance of Questionnaires on Attrition in Online Trials: Randomized Controlled Trial

Jim McCambridge¹ ; Eleftheria Kalaitzaki² ; Ian R. White³ ; Zarnie Khadjesari⁴ ; Elizabeth Murray⁴

; Stuart Linke⁴ ; Simon G. Thompson⁵ ; Christine Godfrey⁶ ; Paul Wallace⁷

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