For citations:

Chomakhidze P.Sh., Poltavskaya M.G., Moszhuhina N.V., Khorobrykh T.V., Vychuzhanin D.V., Syrkin A.L. Cardiopulmonary exercise test in cardiovascular risk prognosis in patients undergoing elective surgery for gastric, esophageal, and pancreatic cancer. Ultrasound & Functional Diagnostics. 2017;(5):54-63. (In Russ.) https://doi.org/10.24835/1607-0771-2017-5-54-63