Liougkos, Athanasios Lisiak, Emil Litarski, Andrzej Loftus, Ian Lubiński, Wojciech Lubos, Leszek Lukasiewicz, Aleksander, Doctor Wladyslaw Bieganski Regional Specialty Hospital in Grudziadz, Poland Lukawski, Krzysztof, Department of General, Vascular and Transplant Surgery Medical University of Warsaw, Poland Macech, Michal, Department of General, Vascular and Transplant Surgery Medical University of Warsaw, Poland Macech, Michał Macech, Michał (Poland) Machnicka, Beata Machoy, Zygmunt Maciag, Rafal, Warszawski Uniwersytet Medyczny Maciąg, Rafał Maciejewski, Marcin Macioch, Waldemar Macioch, Waldemar Macioch, Waldemar, Department Of General And Thoracic Surgery, Medical University Of Warsaw (Poland) Macioch, Waldemar, Clinic of General and Endocrinological Surgery, Medical University of Warsaw, Poland Mackiewicz, Zygmunt Mączka, Ewelina Madej, Krzysztof Madejski, Przemysław Madycki, Grzegorz