IL17A and rheumatoid arthritis: SD: Standard deviation; IQR: Interquartile range; RA: Rheumatoid arthritis; cDMARDs: Conventional disease-modifying antirheumatic drugs; BMI: Body mass index; DAS28: Disease activity score 28; ESR: Erythrocyte sedimentation rate; CRP: C-reactive protein; IL-23: Interleukin-23; IL-17: Interleukin-17; HAQ-II: Health Assessment Questionnaire-II.