. M. . Krzyżak, D. . Maślach, . P. . Pogorzelska, S. . Piekutowska, and A. . Szpak, “Breast cancer mortality in urban and rural female population in Poland in years 2002-2011”, Pol J Public Health, vol. 123, no. 4, pp. 273–276, Dec. 2013, doi: 10.12923/j.0044-2011/123-4/a.01.