For citations:
Kononova A.G., Kolbasnikov S.V., Вel’diev S.N., Belova N.O., Zhirnova O.V. Primary Sjogren's syndrome in practice of gastroenterologist: difficult issues of diagnosis and treatment (clinical observation). Medical alphabet. 2020;(10):52-55. (In Russ.) https://doi.org/10.33667/2078-5631-2020-10-52-55