1. Wilhelm, M., Winkler, A., Rief, W. and Doering, B.K. (2016). Effect of placebo groups on blood pressure in hypertension: a meta-analysis of beta-blocker trials, Journal of the American Society of Hypertension, 10(12), 917-929. https://doi.org/10.1016/j.jash.2016.10.009