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Medical records of 440 ILE patients and 3,397 SLE patients were reviewed for the 1997 American College of Rheumatology (ACR) SLE classification criteria (A), including the major clinical sub-criteria of pericarditis, pleuritis, proteinuria, cellular casts, seizure, psychosis, hemolytic anemia, and thrombocytopenia (B). *P=0.027, ***P<0.001, ****P<0.0001
