Liu A, Rahman M, Hafström I, Ajeganova S, Frostegård J. Proprotein convertase subtilisin kexin 9 is associated with disease activity and is implicated in immune activation in systemic lupus erythematosus. Lupus. 2020 Jul;29(8):825–35. doi: 10.1177/0961203320926253. PMID: 32479241.