“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”, J. V. N. Karazin Khark. Nat. Univ., Ser. Med., no. 35, Jun. 2018, doi: 10.26565/2313-6693-2018-35-09.