1. Department of Analytical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28, Prague 6, Czech Republic
2. 4th Department of Internal Medicine, General University Hospital in Prague and 1st Faculty of Medicine, Charles University in Prague, U Nemocnice 2, 128 08, Prague 2, Czech Republic
3. Department of Oncology, General University Hospital in Prague and 1st Faculty of Medicine, Charles University in Prague, U Nemocnice 2, 128 08, Prague 2, Czech Republic