TY CONF TI Possibilities of using photodynamic therapy KW photodynamic therapy KW photosensitizers KW light exposure KW photochemical reaction JO ISSUES OF ESTABLISHING THE SEVERITY OF HARM CAUSED TO HUMAN HEALTH AS A RESULT OF EXPOSURE TO A BIOLOGICAL FACTOR AU Levkovskaya, Z.S. AU Gritskevich, O.Y. PY 2024 PB Publishing Center RIOR