Validation of potential classification criteria for systemic sclerosis

1. Johnson, S.R.
2. Fransen, J.
3. Khanna, D.
4. Baron, M.
5. Van Den Hoogen, F.
6. Medsger Jr., T.A.
7. Peschken, C.A.
8. Carreira, P.E.
9. Riemekasten, G.
10. Tyndall, A.
11. Matucci-Cerinic, M.
12. Pope, J.E.