For citations:
Shlyakhto E.V., Villevalde S.V., Soloveva A.E., Zvartau N.E., Sitnikova M.Yu., Fedorova D.N., Vinogradova N.G., Fomin I.V. Rationale and design of multicenter prospective observational study of types, GRAde, VariabilITY, associations and prognosis of orthostatic responses in Heart Failure (GRAVITY-HF). Russian Journal of Cardiology. 2020;25(1):3662. (In Russ.) https://doi.org/10.15829/1560-4071-2020-1-3662
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