- Humboldt University of BerlinEurope : Germany
- Europe : Spain
- University of Illinois at Urbana-ChampaignAmerica : United States (Great Lakes)
- جامعة الإمام محمد بن سعود الإسلاميةMiddle East : Saudi Arabia
- America : United States (Pacific)Europe : Switzerland
- Europe : United Kingdom
- European Union
- Friedrich Schiller University JenaEurope : Germany
- Aix*Marseille University - AMUEurope : France (South-East)
- Europe : Denmark
- Europe : Netherlands, United Kingdom