For citations:
Chumakova O.S., Mirzoev E.E., Pimonov S.P., Ushakova K.V., Voloshina N.M., Arkhipkina T.S., Baklanova T.N. Left fouratrial heart. First clinical case. Kardiologiia. 2020;60(9):149-152. (In Russ.) https://doi.org/10.18087/cardio.2020.9.n619