TY JOUR TI TRADITIONAL METHODS OF CHRONIC RECURRENT AFTHOUS STOMATITIS THERAPY KW chronic recurrent aphthous stomatitis KW therapy KW etiology KW laser therapy KW Helicobacter Pylori JO Actual problems in dentistry AU Nikitina, E.A. AU Borisova, E.G. PY 2021 IS 17 PB TIRAZH Publishing House