1. Univ. of Colorado at Boulder (United States)
2. Univ. of Chicago (United States)
3. National Institute of Standards and Technology (United States)
4. McGill Univ. (Canada)
5. Kavli Institute for Cosmological Physics (United States)
6. Argonne National Lab. (United States)
7. Univ. of California, Berkeley (United States)
8. Univ. of California, Davis (United States)
9. California Institute of Technology (United States)
10. The Univ. of Arizona (United States)
11. Univ. of Michigan (United States)
12. Case Western Reserve Univ. (United States)
13. Univ. of Minnesota (United States)
14. The School of the Art Institute of Chicago (United States)
15. Harvard-Smithsonian Ctr. for Astrophysics (United States)