1Department of Paediatrics and Children Surgery, Medical Institute, North-Eastern Federal University Named After M.K. Ammosov, Yakutsk 677000, Russia.
2Department of the Cardio Rheumatology of the Pediatric Centre of the Republican Hospital No. 1-M.E. Nikolaev National Center of Medicine, Yakutsk 677019, Russia.
3Department of Hospital Therapy, Occupational Diseases and Clinical Pharmacology, Medical Institute, North-Eastern Federal University Named After M.K. Ammosov, Yakutsk 677000, Russia.
4The Rheumatic Disease Center of the Clinic of the Yakut Science Centre of Complex Medical Problems, Yakutsk 677000, Russia.
5Hospital Pediatrics, Saint-Petersburg State Pediatric Medical University, Saint-Petersburg 194100, Russia.
6Laboratory of the Monitoring of Children Health and Medico-Environmental Research, Yakut Science Centre of Сomplex Medical Problems, Yakutsk 677000, Russia.