1. National Institute of Standards and Technology (United States)
2. Princeton Univ. (United States)
3. Canadian Institute for Theoretical Astrophysics, Univ. of Toronto (Canada)
4. Arizona State Univ. (United States)
5. Stockholm Univ. (Sweden)
6. Univ. of Oslo (Norway)
7. Univ. of Illinois at Urbana-Champaign (United States)
8. Univ. of Toronto (Canada)
9. AstroParticule et Cosmologie, Univ. of Paris-Diderot (France)
10. The Univ. of British Columbia (Canada)
11. Univ. of Michigan (United States)
12. California Institute of Technology (United States)
13. Case Western Reserve Univ. (United States)
14. Lab. AIM, Paris-Saclay, Univ. Paris Diderot (France)