text: Source:
  * University of Fribourg (Switzerland, 1966)
  * University of Chicago (US, 1966)
  * University of Edinburgh (United Kingdom, 1979)
  * University of Bologna (Italy, 1989)
  * Goethe University Frankfurt (Germany, 1990)
  * Louis Pasteur University (France, 1991)
  * Harvard University (US, 1993)
  * Scripps Research Institute (US, 2000)
  * University of Innsbruck (Austria, 2010)