
Capillary density: An important parameter in nailfold capillaroscopy
Keywords: RA; rheumatoid arthritis; SLE; systemic lupus erythematosus; RP; Raynaud phenomenon; SSc; systemic sclerosis; CTD; connective tissue diseases; CSURI; capillaroscopic skin ulcer risk index; DU; digital ulcer; PRINCESS; Prognostic Rule-based Instructions us