The efficacy and safety of the herbal medicine <Emphasis Type="Italic">geonchildan</Emphasis> for patients with active rheumatoid arthritis: study protocol for a randomized, double-blind, placebo-controlled, parallel pilot trial

This study aims to assess the efficacy and safety of geonchildan, a Korean traditional herbal medicine, for patients with active rheumatoid arthritis (RA) and evaluate the feasibility of a large-scale confirmatory clinical trial.