Department of Gastroenterology and Hepatology;
University Hospital of Essen;
Hufelandstr. 55;
45122 Essen;
Germany;
Department of General;
Visceral and Transplantation Surgel'y;
(Jniversity Hospital of Essen;
Hufelandstr. 55;
45122 Essen;
Germany;
Institute for Physiological chemistry;
UniversityHospital of Essen;
Hufelandstr. 55;
45122 Essen;
Germany;
Department of Surgery and Transplaniation;
Semmelweis University;
Baross u. 23;
H-1082;
Budapest;
Hungary;