Kravchenko, V. V., and N. M. Orlova. “Modern Onkoepidemiological Situation and Timeliness of Diagnosis of Malignant Neoplasms in Kiev”. Journal of Education, Health and Sport, vol. 7, no. 4, Apr. 2017, pp. 847-61, https://apcz.umk.pl/JEHS/article/view/5572.