1. Department of Epidemiology, School of Public Health, University of North
Carolina–Chapel Hill, Chapel Hill, North Carolina, USA
2. Division of Epidemiology, Department of Public Health Sciences, School
of Medicine, University of California–Davis, Davis, California, USA
3. Institute of Experimental Medicine, Academy of Sciences, Prague, Czech
Republic
4. Regional Institute of Hygiene, Prachatice, Czech Republic
5. Health Institute of Central Bohemia, Prague, Czech Republic
6. Department of Environmental Sciences and Engineering, University of North
Carolina–Chapel Hill, Chapel Hill, North Carolina, USA