Fig. 1From: Psychometric validation of the Hand Disability in Systemic Sclerosis-Digital Ulcers (HDISS-DU®) patient-reported outcome instrumentSchematic of the development, content validation and psychometric evaluation of the HDISS-DU instrument. CHFS, Cochin Hand Function Scale; HDDIS-DU, Hand Disability in Systemic Sclerosis-Digital Ulcers; n, number of participants; PROM, patient-reported outcome measure; SSc-DU, systemic sclerosis-related digital ulcerBack to article page