Witte T, Kiltz U, Haas F, Riechers E, et al. The impact of C-reactive protein levels on the effectiveness of upadacitinib in
patients with rheumatoid arthritis: a 12-month prospective, non-interventional
German study. Clin Exp Rheumatol 2023 Nov 15. doi: 10.55563/clinexprheumatol/11255.
PMID: 37976112