1. Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
2. Swiss Tropical and Public Health Institute, Basel, Switzerland
3. University of Basel, Basel, Switzerland
4. Institute for Risk Assessment Sciences, Utrecht University, Utrecht, Netherlands
5. MRC-PHE Centre for Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London, UK
6. National Human Genome Research Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland, USA
7. University Medical Center Groningen, Groningen, Netherlands