1. Institute of Forensic Medicine and Toxicology, University Hospital in Prague, Studničkova 4, 128 00 Praha 2, CZ.
2. Faculty of Science, Charles University, Prague, Hlavova 2030, 128 43 Praha 2, CZ.
3. Institute of Chemical Technology, Technická 6, 160 00 Prague 6, CZ.
4. Institute of Hygiene and Epidemiology of the 1st Medical Faculty, Charles University, Prague, Studničkova 2, 128 00 Praha 2, CZ.