1. Institute of Parasitology and Biomedicine López-Neyra CSIC; Granada Spain
2. University of Texas Health Science Center, Houston
3. Valle de Hebrón Hospital; Barcelona Spain
4. 12 de Octubre University Hospital; Madrid Spain
5. Clinic University Hospital; Granada Spain
6. Complexo Hospitalario Universitario de Vigo; Vigo Spain
7. Hospital General Universitario de Valencia; Valencia Spain
8. Hospital Universitari de Bellvitge; Barcelona Spain
9. Hospital Universitari Doctor Peset; Valencia Spain
10. Hospital Clínico San Carlos; Madrid Spain
11. Hospital Universitario La Paz, Instituto de Investigación Sanitaria La Paz; Madrid Spain
12. Hospital Universitario La Princesa, Instituto de Investigación Sanitaria La Princesa; Madrid Spain
13. University of Cantabria; Santander Spain
14. Referral Center for Systemic Autoimmune Diseases, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico di Milano; Milan Italy
15. Università degli Studi di Verona; Verona Italy
16. Università Politecnica delle Marche and Ospedali Riuniti; Ancona Italy
17. Hannover Medical School; Hannover Germany
18. University of Cologne; Cologne Germany
19. University of Erlangen-Nuremberg; Erlangen Germany
20. University of Lübeck; Lübeck Germany
21. Leiden University Medical Center; Leiden The Netherlands
22. VU University Medical Center; Amsterdam The Netherlands
23. Radboud University Nijmegen Medical Center; Nijmegen The Netherlands
24. Oslo University Hospital Rikshospitalet and Institute of Clinical Medicine, University of Oslo; Oslo Norway
25. University of Otago; Otago New Zealand
26. Lund University; Lund Sweden
27. Karolinska University Hospital, Karolinska Institutet; Stockholm Sweden
28. University of Manchester, Manchester Academic Health Science Centre; Manchester UK
29. University Medical Center Utrecht; Utrecht The Netherlands
30. Centre for Rheumatology, Royal Free and University College Medical School; London UK
31. University Medical Center Utrecht, Utrecht, The Netherlands. Members of the Spanish Scleroderma Group are shown in Appendix A