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  1. 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
  2. Enclosing a pen to improve response rate to postal questionnaire: an embedded randomised controlled trial
  3. An evaluation of a personalised text message reminder compared to a standard text message on postal questionnaire response rates: an embedded randomised controlled trial
  4. Does handwriting the name of a potential trial participant on an invitation letter improve recruitment rates? A randomised controlled study within a trial
  5. Using pens as an incentive for trial recruitment of older adults: An embedded randomised controlled trial
  6. A nested randomised controlled trial of a newsletter and Post-it® note did not increase postal questionnaire response rates in a falls prevention trial