1. Centre for Environmental Sciences, Hasselt University, Diepenbeek, Limburg, Belgium
2. Department of Physiology, Hasselt University, Diepenbeek, Limburg, Belgium
3. Department of Obstetrics, East-Limburg Hospital, Genk, Limburg, Belgium
4. Belgian Interregional Environment Agency, Brussels, Brussels Capital Region, Belgium
5. I-BioStat, Hasselt University, Diepenbeek, Limburg, Belgium
6. I-Biostat, Leuven University (KU Leuven), Leuven, Flemish Brabant, Belgium
7. Laboratory of Clinical Biology, East-Limburg Hospital, Genk, Limburg, Belgium
8. Unit Environmental Risk and Health, Flemish Institute for Technological Research, Mol, Antwerp, Belgium
9. Department of Public Health and Primary Care, Leuven University (KU Leuven), Leuven, Flemish Brabant, Belgium