Rybachuk, Ann, Zoriana Hbur, Oksana Zavada, and Irina Krylova. 2021. “Malignant Neoplasms of the Lips, Oral Cavity and Pharynx – State of the Problem”. Journal of Education, Health and Sport 11 (11):346-57. https://doi.org/10.12775/JEHS.2021.11.11.033.