Matucci-Cerinic, M; Krieg, T; Guillevin, L; Schwierin, B; Rosenberg, D; Cornelisse, P; Denton, CP; (2015) Elucidating the burden of recurrent and chronic digital ulcers in systemic sclerosis: long-term results from the DUO Registry. Annals of the Rheumatic Diseases , 75 pp. 1770-1776. 10.1136/annrheumdis-2015-208121 <https://doi.org/10.1136/annrheumdis-2015-208121>. Green open access