| 1 |
University of Rome La Sapienza |
21 |
| 2 |
Complutense University of Madrid |
15 |
| 3 |
University of Buenos Aires |
14 |
| 4 |
Ohio State University |
13 |
| 5 |
University of Bonn |
10 |
| 6 |
University of Queensland |
9 |
| 7 |
University of Michigan, Ann Arbor |
8 |
| 7 |
The National University of Colombia |
8 |
| 7 |
Louisiana State University |
8 |
| 10 |
University of Cambridge |
7 |
| 10 |
University of California, Davis |
7 |
| 10 |
University of Texas at Austin |
7 |
| 10 |
Washington State University |
7 |
| 14 |
Pennsylvania State University |
6 |
| 14 |
University of North Carolina at Chapel Hill |
6 |
| 14 |
University of California, Berkeley |
6 |
| 17 |
University of Melbourne |
5 |
| 17 |
McGill University |
5 |
| 17 |
University of New Mexico |
5 |
| 17 |
University of Iowa |
5 |
| 21 |
University of Goettingen |
4 |
| 21 |
Lomonosov Moscow State University |
4 |
| 21 |
University of Wisconsin–Madison |
4 |
| 21 |
University of Oxford |
4 |
| 21 |
Johns Hopkins University |
4 |
| 21 |
Pierre-and-Marie-Curie University |
4 |
| 21 |
University of Arizona |
4 |
| 28 |
Harvard University |
3 |
| 28 |
Aarhus University |
3 |
| 28 |
University College London |
3 |
| 28 |
University of Chicago |
3 |
| 28 |
University of Copenhagen |
3 |
| 28 |
University of Edinburgh |
3 |
| 28 |
University of Leiden |
3 |
| 28 |
King's College London |
3 |
| 28 |
University of Minnesota, Twin Cities |
3 |
| 28 |
Uppsala University |
3 |
| 28 |
Arizona State University |
3 |
| 28 |
University of Missouri Columbia |
3 |
| 28 |
Virginia Tech |
3 |
| 28 |
The University of Utah |
3 |
| 28 |
North Carolina State University, Raleigh |
3 |
| 28 |
Rutgers University |
3 |
| 28 |
University of Missouri |
3 |
| 45 |
University of Maryland, College Park |
2 |
| 45 |
Peking University |
2 |
| 45 |
University of Washington |
2 |
| 45 |
Texas A&M University |
2 |
| 45 |
Massachusetts Institute of Technology |
2 |
| 45 |
University of Vienna |
2 |