Avouac, J., Fransen, J., Walker, U., Riccieri, V., Smith, V., Muller, C., Miniati, I., Tarner, I., Randone, S. B., Cutolo, M., Allanore, Y., Distler, O., Valentini, G., Czirjak, L., Müller-Ladner, U., Furst, D., Tyndall, A., Matucci-Cerinic, M., & , (2011). preliminary criteria for the very early diagnosis of systemic sclerosis: results of a Delphi Consensus Study from EULAR Scleroderma Trials and Research Group. Annals of the rheumatic diseases, 70(3), 476–481. http://access.bl.uk/ark:/81055/vdc_100135158267.0x000057