1. Uppsala University, Uppsala, Sweden
2. University of Helsinki, Helsinki, Finland
3. KTH Royal Institute of Technology, Stockholm, Sweden
4. University of Glasgow, Glasgow, United Kingdom
5. University of California, San Diego, San Diego, CA, USA
6. University of New Hampshire, Manchester, NH, USA
7. University at Buffalo, Buffalo, NY, USA
8. University of Massachusetts Amherst, Amherst, MA, USA