Publication PMID: 19370710Dillon SP, D'Souza A, Kurien BT, Scofield RH. Systemic lupus erythematosus and C1q: A quantitative ELISA for determining C1q levels in serum. Biotechnol J 4:1210-4, 2009 August, PMID: 19370710, PMCID: PMC2829988