1. Studies Coordinating Centre, Division of Hypertension and Cardiovascular Rehabilitation, Department of Cardiovascular Diseases
2. School of Public Health, Department of Occupational and Environmental Medicine, University of Leuven, Leuven, Belgium
3. Department of Environmental Biology, University of Hasselt, Diepenbeek, Belgium
4. Social and Geography Section, Department of Earth and Environment Sciences, University of Leuven, Leuven, Belgium
5. Department of Epidemiology, Maastricht University, Maastricht, the Netherlands
6. Industrial Toxicology and Occupational Medicine Unit, Université catholique de Louvain, Brussels, Belgium