1 Institute of Medical Biochemistry and Laboratory Diagnostics, Faculty General Hospital and 1st Faculty of Medicine, Charles University, Prague, Czech Republic.
2 Department of Surgery, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, the Netherlands.
3 Department of General, Visceral and Transplantation Surgery, RWTH University Hospital Aachen, Aachen, Germany.