Jordan, S., Watkins, A., Storey, M., Allen, S. J., Brooks, C., Garaiova, I., . . . Morgan, G. (2013). 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. PLoS ONE, 8(7), p. e67912. doi:10.1371/journal.pone.0067912

Jordan, Sue, et al. "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." PLoS ONE 8, no. 7 (2013): e67912.

Jordan, Sue, et al. "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." PLoS ONE 8.7 (2013): e67912.