1. University of Bristol, Bristol, United Kingdom
2. Harvard University, Cambridge, MA, USA
3. University of North Carolina at Charlotte, Charlotte, NC, USA
4. University of Illinois at Urbana-Champaign, Champaign, IL, USA
5. MINES ParisTech PSL Research University, Paris, France
6. University of Otago, Dunedin, New Zealand
7. University of Cambridge, Cambridge, United Kingdom
8. University of British Columbia, Vancouver, BC, Canada