For citations:
Surkova E.V., Antsiferov M.B. R. Fletcher, S. Fletcher, E. Wagner. Clinical Epidemiology. The basics of evidence-based medicine. - M .: Media Sphere, 1998. Problems of Endocrinology. 1999;45(3):47-48. (In Russ.) https://doi.org/10.14341/probl11773

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