1. University Medical Center, Utrecht, The Netherlands;
2. Erasmus Medical Center-HOVON Data Center, Rotterdam, The Netherlands;
3. VU Medical Center, Amsterdam, The Netherlands;
4. Universital Medical Center, Groningen, The Netherlands;
5. Radboud Hospital, Nijmegen, The Netherlands;
6. Amsterdam Medical Center, Amsterdam, The Netherlands;
7. Leiden University Medical Center, Leiden, The Netherlands;
8. Haga Hospital, Den Haag, The Netherlands;
9. Medisch Spectrum Twente, Enschede, The Netherlands;
10. Antonius Hospital, Nieuwegein, The Netherlands;
11. Meander Medical Center, Amersfoort, The Netherlands;
12. University of Leuven, Leuven, Belgium;
13. Albert Schweitzer Hospital, Dordrecht, The Netherlands;
14. Academisch Ziekenhuis, Maastricht, The Netherlands;
15. Atrium MC, Heerlen, The Netherlands;
16. Jeroen Bosch Hospital, Den Bosch, The Netherlands;
17. Isala Kliniek, Zwolle, The Netherlands;
18. Medisch Centrum, Leeuwarden, The Netherlands; and
19. Erasmus Medical Center, Rotterdam, The Netherlands