“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" [Preprint], (35). doi:10.26565/2313-6693-2018-35-09.