Chudzik, Robert, Katarzyna Jarosz-Chudzik, Maria Gołębiowska, Beata Gołębiowska, and Marcin Kulczyński. 2018. “New Possibilities in Pectus Excavatum”. Journal of Education, Health and Sport 8 (7):562-68. https://apcz.umk.pl/JEHS/article/view/5802.