1. Cornell University, Ithaca, NY, USA
2. Research Triangle Institute (RTI) International, San Francisco, CA, USA
3. Washington University-St. Louis, St. Louis, MO, USA
4. University of California, Berkeley
5. Rutgers University-Newark, Newark, NJ, USA
6. Yale University, New Haven, CT, USA
7. Rockwool Foundation Research Unit, Copenhagen, Denmark