1. School of Pharmacy and Medical Science, Griffith University, Southport, Qld 4222, Australia
2. Institute of Biotechnology, Czech Academy of Sciences, 252 50 Prague, Czech Republic
3. Faculty of Science, Charles University, 128 00 Prague, Czech Republic
4. First Faculty of Medicine, Charles University, 121 08 Prague, Czech Republic
5. General University Hospital, Charles University, 128 08 Prague, Czech Republic