Supporting agencies: The author thanks Ruslan T. Saigitov, Dr. Sci. (Med.), Scientific Editor of Pediatr Publishing House, Director of scientific and publishing projects of the Association of Pediatric Rheumatologists; Natalia V. Sokolova, Cand. Sci. (Eng.), Associate Professor, Director of the Center for Information and Library Systems of the Peter the Great St. Petersburg Polytechnic University, for the critical comments on the manuscript daft and also Tatiana Loskutova for reference list arrangements