For citations:
Martsevich S.Yu., Kutishenko N.P. Randomised Clinical Trials and Observational Studies: the Ratio in the Hierarchy of Evidence of the Efficacy of Drugs. Rational Pharmacotherapy in Cardiology. 2016;12(5):567-573. (In Russ.) https://doi.org/10.20996/1819-6446-2016-12-5-567-573