Including a pen and/or cover letter, containing social incentive text, had no effect on questionnaire response rate: a factorial randomised controlled Study within a Trial
Sophie James(University of York), Sarah Cotterill(University of Manchester), Caroline Fairhurst(University of York), Sara Rodgers(University of York), Sarah Rhodes(University of Manchester), Adwoa Parker(University of York), David Torgerson(University of York), Sarah Cockayne(University of York)
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