TY JOUR TI MODERN VIEW ON THE PROBLEM OF OSTEOPOROSIS IN ANKYLOSING SPONDYLITIS KW ankylosing spondylitis KW osteoporosis JO Clinical Medicine and Pharmacology AU Raskina, T.A. AU Malyshenko, O.S. AU Pirigova, M.V. AU Letaeva, M.V. AU Averkieva, Y.V. PY 2020 IS 5 PB LLC Information and publishing center Innovations and investments