Features of the course of the chronic rheumatic heart disease in modern conditions - O. O. Yakymenko; L. V. Zakatova; N. M. Antypova; A. A. Serebriakova; L. N. Yefremenkova; V. V. Klochko; S. I. Tabinskyi (Actual problems of transport medicine: environment, occupational health, pathology, 2019)