For citations:

Oboukhova O.A., Orekhov O.O., Tsourko V.V., Kaliteyevsky P.F. Lethal outcomes in middle-aged and elderly patients with rheumatic heart diseases. Rheumatology Science and Practice. 2003;41(1):33-35. (In Russ.) https://doi.org/10.14412/1995-4484-2003-1131