For citations:
Lukina G.V., Kulakova P.I., Novikov A.A., Savenkova N.A., Alexandrova E.A., Volnukhin E.V., Kovshik A.N. Frequency of inflammatory bowel diseases in patients with ankylosing spondylitis. Medical alphabet. 2019;2(37):12-15. (In Russ.) https://doi.org/10.33667/2078-5631-2019-2-37(412)-12-15