Links[1] http://www.kardiochirurgiadziecieca.cm-uj.krakow.pl [2] https://www.ctsnet.org/user/login?destination=user/413885 [3] https://www.ctsnet.org/print/home/jskalski [4] https://www.ctsnet.org/society/ctsnet [5] https://www.ctsnet.org/society/eacts [6] https://www.ctsnet.org/society/sts