Calprotectin is not independent from baseline erosion in predicting radiological progression in early rheumatoid arthritis. Comment on 'Calprotectin as a marker of inflammation in patients with early rheumatoid arthritis' by Jonsson et al. Issue 12 (10th January 2018) - Chevreau, Maxime; Paclet, Marie-Hélène; Romand, Xavier; Quesada, Jean-Louis; Vittecoq, Olivier; Dieudé, Philippe; Toussaint, Bertrand; Gaudin, Philippe; Baillet, Athan