Gawełko, Jan, Marek Cierpiał-Wolan, Justyna Podgórska-Bednarz, and Andrzej Kawecki. 2017. “Morbidity Trend of Lip Cancer in Podkarpacie and in Poland in the Years 1963–2013”. European Journal of Clinical and Experimental Medicine 15 (1):32–38. https://doi.org/10.15584/ejcem.2017.1.5.