1. Harvard University, Cambridge, MA, USA
2. Zhejiang University, Zhejiang, China
3. University of Oxford, Oxford, U.K.
4. Tsinghua University, Beijing, China
5. University of Konstanz, Konstanz, Germany
6. Arizona State University, Tempe, AZ, USA
7. TU Wien, Vienna, Austria
8. MIT-IBM Watson AI Lab, Cambridge, MA, USA