?:authorAffiliation
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[\'Department of Clinical Immunology, Medical Faculty, University Hospital \'Lozenetz\', Sofia University St. Kliment Ohridski, 1 Kozyak Str., 1407, Sofia, Bulgaria.\', \'First Department of Internal Medicine, Faculty of Medicine, Medical University-Varna, 55 Marin Drinov Str., Varna, 9002, Bulgaria. tsetso@medfaculty.org.\', \'Clinic of Rheumatology, University Hospital \'St. Marina\', 1 Hristo Smirnenski Blvd., 9010, Varna, Bulgaria. tsetso@medfaculty.org.\']
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