Clinical features and comorbidity patterns in early and very early rheumatoid arthritis: Insights from a China nationwide survey. - Xu, Haojie; Zhang, Liyun; Huo, Yuehong; Wu, Rui; Wu, Lijun; Lei, Ling; Geng, Linyu; Tan, Chunyu; Li, Xiaomei; Li, Ru; Su, Yin (Rheumatology & Autoimmunity, 2026)