1. Research Centre for Toxic Compounds in the Environment, Faculty of Science, Masaryk University, Kamenice 753/5, D29, 625 00 Brno, Czech Republic
2. Research Department of Epidemiology and Public Health, University College London, 1-19 Torrington Place, London WC1E 7HB, UK
3. The National Institute of Public Health, Šrobárova 49/48, 100 00 Praha, Czech Republic