The effect of using social pressure in cover letters to improve retention in a longitudinal health study: an embedded randomised controlled retention trial. [electronic resource]

By: Contributor(s): Producer: 20180430Description: 341 p. digitalISSN:
  • 1745-6215
Subject(s): Online resources: In: Trials vol. 18
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Publication Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't

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