Response to: 'Performance of the systemic lupus erythematosus disease activity score (SLE-DAS) in a Latin American population' by Rodríguez-González et al. Issue 12 (7th August 2019) - Jesus, Diogo; Matos, Ana; Henriques, Carla; Zen, Margherita; Doria, Andrea; Inês, Luís Sousa