For citations:

Erdes SF, Sakharova KV. Clinical picture of ankylosing spondylitis in HLA-B27 positive and negative patients. Sovremennaya Revmatologiya=Modern Rheumatology Journal. 2023;17(5):61-66. (In Russ.) https://doi.org/10.14412/1996-7012-2023-5-61-66