1. Department of Chemistry and Biochemistry, Mendel University in Brno, CZ-613 00 Brno, Czech Republic
2. Central European Institute of Technology, Brno University of Technology, CZ-616 00 Brno, Czech Republic
3. Department of Paediatric Haematology and Oncology, 2nd Faculty of Medicine, Charles University, and University Hospital Motol, CZ-150 06 Prague 5, Czech Republic
4. Department of Biochemistry, Faculty of Science, Charles University, CZ-128 40 Prague 2, Czech Republic