Samadova Nigina Alisherovna, Madjidova Gulbahor Tolibovna, Yaxyoev Azim Akmalovich, and Melikov Ulug’bek Shavkatovich. “A Modern Approach to Risk Stratification in Patients With Heart Failure With Preserved and Reduced Ejection Fraction”. Eurasian Scientific Herald, vol. 8, May 2022, pp. 25-31, https://geniusjournals.org/index.php/esh/article/view/1330.