1. Department of Medicine, Karolinska Institute at Huddinge and Solna, Stockholm, Sweden;
2. Centro Interdipartimentale di Biostatistica e Bioinformatica, Università di Roma Tor Vergata, Italy;
3. University of Heidelberg, Germany;
4. Medical University of Vienna, Austria;
5. Helsinki University Central Hospital, Finland;
6. University of Modena, Italy;
7. CSS Hospital IRCCS, San Giovanni Rotondo, Italy;
8. Ankara University Faculty of Medicine, Turkey;
9. Ospedale di Careggi, Florence, Italy;
10. Ospedale Ferrarotto, Catania, Italy;
11. University of Milano, Italy;
12. Leiden University Medical Center, The Netherlands;
13. Radboud University Nijmegen Medical Center, The Netherlands;
14. The Queens University, Belfast, United Kingdom;
15. University Hospital Leipzig, Germany;
16. Hopital St Antoine, Paris, France; and
17. University Hospital Hamburg-Eppendorf, Germany