TY JOUR TI COMPARISON OF THE SHANNON BIODIVERSITY INDEX OF STUDY GROUPS KW periodontitis KW COVID-19 KW stomatitis herpetiformis KW candida infection KW biodiversity JO Actual problems in dentistry AU Zinecker, D.T. AU Modina, T.N. AU Khusainov, I.K. AU Cinekker, D.A. AU Mamaeva, E.V. PY 2024 IS 20 PB TIRAZH Publishing House