TY JOUR TI Pantohematogen Efficacy Evaluation in Complex Sanatorium Rehabilitation of Patients with post-COVID-19 Syndrome: an Open Randomized Cohort Study KW post-COVID-19 syndrome KW pantotherapy KW food supplement KW pantohematogen KW rehabilitation program KW sanatorium JO Bulletin of Rehabilitation Medicine AU Shakula., A.V. AU Nesina., I.A. AU Pavlov., A.I. AU Kurniavkina., E.A. AU Chursina., V.S. AU Telepanova., I.V. PY 2022 IS 21 PB Federal State Budgetary Institution «National Medical Research Center of Rehabilitation and Balneology» of Ministry of Healthcare of Russian Federation