Skelly AC, Dettori JR, Brodt ED. Assessing bias: the importance of considering confounding. Evid Based Spine Care J. 2012;3(1):9-12. doi:10.1055/s-0031-1298595
Temple R, Ellenberg SS. Placebo-controlled trials and active-control trials in the evaluation of new treatments. Part 1: ethical and scientific issues. Ann Intern Med. 2000;133(6):455-63.
Ellenberg SS, Temple R. Placebo-controlled trials and active-control trials in the evaluation of new treatments. Part 2: practical issues and specific cases. Ann Intern Med. 2000;133(6):464-70.
Castro M. Placebo versus best-available-therapy control group in clinical trials for pharmacologic therapies.Proc Am Thorac Soc. 2007 Oct 1;4(7):570-3.