Walters, S. J., Jacques, R. M., dos Anjos Henriques-Cadby, I. B., Candlish, J., Totton, N., & Xian, M. T. S. (2019). Sample size estimation for randomised controlled trials with repeated assessment of patient-reported outcomes: What correlation between baseline and follow-up outcomes should we assume? Trials.

Walters, Stephen J., Richard M. Jacques, Inês Bonacho dos Anjos Henriques-Cadby, Jane Candlish, Nikki Totton, i Mica Teo Shu Xian. "Sample Size Estimation for Randomised Controlled Trials With Repeated Assessment of Patient-reported Outcomes: What Correlation between Baseline and Follow-up Outcomes Should We Assume?" Trials 2019.

Walters, Stephen J., et al. "Sample Size Estimation for Randomised Controlled Trials With Repeated Assessment of Patient-reported Outcomes: What Correlation between Baseline and Follow-up Outcomes Should We Assume?" Trials 2019.