1. Department of Analytical Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic
2. Military University Hospital Prague, Department of Medicine 1st Faculty of Medicine Charles University and Military University Hospital Prague, U Vojenské nemocnice 1200, 169 02 Prague 6, Czech Republic
3. Department of Internal Medicine, University of Defense, Faculty of Military Health Sciences in Hradec Kralove, Třebešská 1575, 500 01 Hradec Kralove, Czech Republic