For citations:

Melnitskaia A.A., Matchekhina L.V., Tkacheva O.N., Ilyushchenko A.K., Tyazhelnikov A.A., Polunin V.S., Yumukyan A.V., Strazhesko I.D. RUSS-AGE: developed research protocol for the creation of Russian biological age calculators. Russian Journal of Geriatric Medicine. 2023;16(4):239-247. (In Russ.) https://doi.org/10.37586/2686-8636-4-2023-239-247