1. Harvard University, - USA
2. University of Cambridge - UK
3. Stanford University - USA
4. Yale University, - USA
5. University College London - UK
6. Universidad Nacional Autónoma de México - Mexico
7. Imperial College London- UK
8. University of California, Berkeley - USA
9. University of Oxford - UK
10. Peking University - China
11. University of Pennsylvania - USA
12. The University of Chicago - USA
13. Princeton University - USA
14. Massachusetts Institute of Technology - USA
15. California Institute of Technology - USA
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