1. Environmental Health Science and Research Bureau, Health Canada, Ottawa, Canada
2. Vireo Advisors, LLC, Boston, MA, USA
3. School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK
4. Retired International Research Cooperation Manager, Empa – Swiss Federal Laboratories for Science and Materials Technology, St. Gallen, Switzerland
5. NanoCASE GmbH, Engelburg, Switzerland
6. National Institute for Occupational Safety and Health, Nanotechnology Research Center, Cincinnati, OH, USA
7. National Institute for Public Health and the Environment (RIVM), Bilthoven, Netherlands