Enclosing a pen in a postal questionnaire follow-up to increase response rate: a study within a trial [version 1; peer review: 2 approved]
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D. Torgerson | A. Booth | G. Tew | G. Parkinson | C. Fairhurst | C. Hewitt | Camila S Maturana | Jess Hugill-Jones | Laura Bissell | L. Wiley | Fiona Rose