THE FREQUENCY OF USE OF COMBINATIONS OF ANTIHYPERTENSIVE DRUGS IN PATIENTS WITH DIFFICULT-TO-CONTROL HYPERTENSION ON THE BACKGROUND OF BIOFEEDBACK AND PACED BREATHING AND HEART RATE VARIABILITY. (2018). The Journal of V. N. Karazin Kharkiv National University, Series "Medicine", 35. https://doi.org/10.26565/2313-6693-2018-35-09