1. Centre for Environmental Sciences, Hasselt University, Hasselt 3500, Belgium
2. Department of Public Health & Primary Care, Leuven University, Leuven 3000, Belgium
3. Department of Analytical and Environmental Chemistry, Vrije Universiteit Brussel, Brussels 1050, Belgium
4. Interuniversity Institute for Biostatistics and Statistical Bioinformatics, Hasselt University, Diepenbeek 3590, Belgium
5. Department of Public Health, Ghent University, Ghent 9000, Belgium
6. Provincial Institute for Hygiene, Antwerp 2000, Belgium
7. Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Aachen 52062, Germany
8. Environmental Risk and Health, Flemish Institute for Technological Research (VITO), Mol 2400, Belgium