Development and validation of the Scleroderma Clinical Trials Consortium Damage Index (SCTC-DI): a novel instrument to quantify organ damage in systemic sclerosis. - Ferdowsi N; Huq M; Stevens W; Hudson M; Wang M; Tay T; Burchell JL; Mancuso S; Rabusa C; Sundararajan V; Prior D; Proudman SM; et al. (Annals of the rheumatic diseases, 2019)