Comment on: Auto-antibodies to double-stranded DNA as biomarker in systemic lupus erythematosus: comparison of different assays during quiescent and active disease. - Piga, Matteo; Floris, Alberto; Mathieu, Alessandro; Cauli, Alberto; de Leeuw, Karina; Bungener, Laura; Roozendaal, Caroline; Bootsma, Hendrika; Stegeman, Coen A. (Rheumatology, 2017)