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Thanou A, Chakravarty E, James JA, Merrill JT. How should lupus flares be measured? Deconstruction of the safety of estrogen in lupus erythematosus national assessment-systemic lupus erythematosus disease activity index flare index. Rheumatology (Oxford) 53:2175-81, 2014 December, PMID: 24729400, PMCID: PMC4542656