For citations:
Larina V.N., Bart B.Ya., Karpenko D.G., Starostin I.V., Larin V.G., Kulbachinskaya O.M. Polymorbidity and its association with the unfavorable course of chronic heart failure in outpatients aged 60 years and older. Kardiologiia. 2019;59(12S):25-36. (In Russ.) https://doi.org/10.18087/cardio.n431