Correspondence to Dr Zhiqi Zhang, Department of Joint Surgery, Sun Yat-sen University First Affiliated Hospital, Guangzhou 510080, China; zhzhiqi{at}mail.sysu.edu.cn; Dr Weiming Liao; ...

Objective: To evaluate the efficacy and safety of adding sulfasalazine to leflunomide treatment compared with switching to sulfasalazine alone in patients with RA with an inadequate response to ...