European multicentre study to define disease activity criteria for systemic sclerosis. II. Identification of disease activity variables and development of preliminary activity indexes
G Valentini, A Della Rossa, S Bombardieri, W Bencivelli, A J Silman, S D'Angelo, M Matucci Cerinic, J F Belch, C M Black, P Bruhlmann, L Czirják, A De Luca, A A Drosos, C Ferri, A Gabrielli, R Giacomelli, G Hayem, M Inanc, N J McHugh, H Nielsen, M Rosada, R Scorza, J Stork, A Sysa, F H J van den Hoogen, P J Vlachoyiannopoulos
Annals of the Rheumatic Diseases Jun 2001, 60 (6) 592-598; DOI: 10.1136/ard.60.6.592