The study included 280 patients with SLE and 260 HSs. All patients satisfied at least 4 of the revised American College of Rheumatology (1997) criteria for the classification of SLE30. This study was approved by the Institutional Review Board of Ajou University Hospital (AJIRB-BMR-GEN-15-237), and informed consents were given by all subjects. All procedures for this study were carried out in accordance with the approved guidelines. The clinical features, serum test results, and medication status of patients were collected and registered in a database. Blood samples were collected from patients with SLE and HSs and immediately stored at −70 °C.
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