1. KU Leuven (University of Leuven), Department of Oral Health Sciences, Biomat & UZ Leuven (University Hospitals Leuven), Dentistry, Leuven, Belgium
2. KU Leuven (University of Leuven), Environment and Health, Department of Public Health and Primary Care, Leuven, Belgium
3. Idewe, External Service for Prevention and Protection at Work, Heverlee, Belgium