TY JOUR TI IMMUNOMODULATION IN GERONTOPERIODONTOLOGY: EFFECTS IN HUMORAL IMMUNITY KW gerontoperiodontology KW periodontitis KW humoral immunity KW antibody level KW Polyoxidonium KW gingival fluid JO Actual problems in dentistry AU Popova, A.N. AU Alekhanova, I.F. AU Vasenev, E.E. AU Krajnov, S.V. PY 2018 IS 14 PB TIRAZH Publishing House