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Volunteer Bias in Recruitment, Retention, and Blood Sample Donation in a Randomised Controlled Trial Involving Mothers and Their Children at Six Months and Two Years: A Longitudinal Analysis
- Sue Jordan,
- Alan Watkins,
- Mel Storey,
- Steven J. Allen,
- Caroline J. Brooks,
- Iveta Garaiova,
- Martin L. Heaven,
- Ruth Jones,
- Sue F. Plummer,
- Ian T. Russell
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- Published: July 9, 2013
- https://doi.org/10.1371/journal.pone.0067912