1. Massachusettes Institute of Technology, Cambridge, Massachusetts, USA
2. Indiana University, Bloomington, IN, USA
3. Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
4. Microsoft Research, USA
5. Northwestern University, Evanston, Illinois, USA
6. University of California, Berkeley, California, USA
7. Georgia Institute of Technology, Atlanta, Georgia, USA
8. University of California, Berkeley, Berkeley, California, USA