1. Roswell Park Comprehensive Cancer Research Center, Buffalo, New York
2. Rijnstate Hospital- Stichting, Arnhem, Arnhem, the Netherlands
3. Beth Israel Deaconess Medical Center, Boston, Massachusetts
4. Orsi Academy/OLVZ (Onze-Lieve-Vrouwziekenhuis Ziekenhuis) Aalst, Aalst, Belgium
5. Guy's Hospital, London, UK
6. Henry Ford Health System, Detroit, Michigan