Affiliation: | Jarosław Cwaliński, Jacek Hermann, Tomasz Banasiewicz, Department of General and Endocrynologic Surgery and Gastroenterologic Oncology, Poznan University of Medical Sciences, Poznan 60-355, PolandMariusz Kasprzyk, Department of Thoracic Surgery, Poznan University of Medical Sciences, Poznan 60-355, Poland |