For citations:
Godzenko AA, Cheremushkina EV, Dimitreva AE, Urumova MM. Combination of ankylosing spondylitis and rheumatoid arthritis: clinical observations and literature review. Sovremennaya Revmatologiya=Modern Rheumatology Journal. 2021;15(4):72-80. (In Russ.) https://doi.org/10.14412/1996-7012-2021-4-72-80