1. School of Computer Science Georgia Tech,Atlanta,USA
2. University of Waterloo,School of Computer Science,Waterloo,Canada
3. ETH Zurich,Department of Computer Science,Zurich,Switzerland
4. Stanford University,Department of Mathematics,Palo Alto,USA
5. University of Toronto,Department of Computer Science,Toronto,Canada
6. Stanford University,Department of Management Science & Engineering and Department of Computer Science,Palo Alto,USA