1. School of Computing Science, Simon Fraser University, Surrey, BC, Canada
2. Department of Computer Science, University of Toronto, Toronto, ON, Canada
3. Department of Information Science Technology, University of Houston, Houston, TX, USA
4. Department of Computer Science, University of British Columbia, Vancouver, BC, USA
5. Department of Mathematical and Computational Sciences, University of Toronto Mississauga, Mississauga, ON, Canada
6. Department of Computer Science, University of Illinois Urbana-Champaign, Urbana, IL, USA
7. School of Informatics, University of Edinburgh, Edinburgh, Scotland, United Kingdom
8. Department of Computer Science, University of Illinois Chicago, Chicago, IL, USA
9. Department of Human Centred Computing, Monash University, Clayton, Victoria, Australia
10. University of Glasgow, Glasgow, Scotland, United Kingdom
11. Computer Science Department, Swarthmore College, Swarthmore, PA, USA