Describir: Analysis of covariance and sample size calculation for comparing means in randomized controlled trials...Koche Ghazi MK, Ghaffari S, Naemi M, et al. Effects of sodium selenite and selenium-enriched yeast on cardiometabolic indices of patients with atherosclerosis: a double-blind randomized clinical trial study. J Cardiovasc Thorac Res. 2021;13(4):314-9.