1. Ziekenhuis Oost-Limburg; Genk Belgium
2. Hasselt University, Diepenbeek/Hasselt; Belgium
3. University Hospitals Leuven; Leuven Belgium
4. CHR Citadelle Hospital; Liege Belgium
5. University Medical Center Groningen; Groningen The Netherlands
6. Helsinki University Central Hospital; Helsinki Finland
7. University of Paris Diderot; Paris France
8. National and Kapodistrian University of Athens; Athens Greece
9. UniversitätsSpital Zürich; Zürich Switzerland