1. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
2. University of Auckland (New Zealand)
3. University of California, Riverside, CA (United States)
4. University of the Pacific, CA (United States)
5. Yale University, New Haven, CT (United States)
6. University of California, Davis, CA (United States)
7. Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)