1. University Medical Centre Nijmegen, Nijmegen, The Netherlands
2. Twente Hospital Group Location SMT, Hengelo, The Netherlands
3. Canisius Wilhelmina Ziekenhuis, Nijmegen, The Netherlands
4. Academic Medical Centre, Amsterdam, The Netherlands
5. Maasziekenhuis, Boxmeer, The Netherlands
6. Ziekenhuis Velp, Velp, The Netherlands
7. Bradford Hospital National Health Service Trust, Bradford, United Kingdom
8. NDDO Research Foundation, Amsterdam, The Netherlands