| Frequency | Institution Name | Country location |
| 8 | Michigan State Univ | USA |
| 6 | Lund Univ | Sweden |
| 4 | Univ British Columbia | Canada |
| 4 | Iowa State Univ | USA |
| 3 | Univ Delaware | USA |
| 3 | INRA | France |
| 3 | Swiss Fed Inst Technol | Switzerland |
| 3 | Univ Calif Berkeley | USA |
| 3 | James Cook Univ | Australia |
| 3 | Univ Autonoma Barcelona | Spain |
| 3 | N Carolina State Univ | USA |
| 3 | Swedish Univ Agr Sci | Sweden |