1. Department of Analytical Chemistry; Institute of Chemical Technology in Prague; Technická 5 166 28 Prague 6 Czech Republic
2. 1 Department of Surgery-Department of Abdominal, Thoracic Surgery and Traumatology, First Faculty of Medicine; Charles University in Prague and General University Hospital in Prague; U Nemocnice 2 128 00 Prague 2 Czech Republic
3. Department of Oncology, First Faculty of Medicine; Charles University in Prague and General University Hospital in Prague; U Nemocnice 2 120 00 Prague 2 Czech Republic