Europe : Netherlands
- Martin Luther University of Halle-WittenbergEurope : Germany
- America : United StatesEurope
- Europe : Switzerland
- University of MontrealAmerica : Canada
- Europe : France (South-West)
- AfricaEuropeMiddle East
- Europe : Switzerland
- America : Chile
- University of Erlangen-NurembergEurope : Germany
- America : Canada
- Department of Economics, Princeton UniversityAmerica : United States (Mid-Atlantic)