1. University of Rochester Medical Center; Rochester NY USA
2. Georgetown University Hospital; Washington DC USA
3. Brigham and Women's Hospital; Boston MA USA
4. London Health Sciences Centre; London Ontario Canada
5. Hospital Universitari Germans Trias i Pujol; Carretera de Canyet Barcelona Spain
6. Leiden University Medical Center; Leiden the Netherlands
7. University Hospital; Uppsala Sweden
8. Hamilton Health Sciences; McMaster University; Hamilton ON Canada
9. Duke University Medical Center; Durham NC USA
10. Medical University of Vienna; Wien Austria
11. Barts and The London Queen Mary's School of Medicine and Dentistry; London UK