Ramos-Casals, M Hypocomplementemia in systemic lupus erythematosus and primary antiphospholipid syndrome: prevalence and clinical significance in 667 patients. [electronic resource] - Lupus 2004 - 777-83 p. digital Publication Type: Journal Article ISSN: 0961-2033 Standard No.: 10.1191/0961203304lu1080oa doi Subjects--Topical Terms: AdultAntiphospholipid Syndrome--bloodComplement C3--metabolismComplement C4--metabolismComplement Hemolytic Activity AssayComplement System Proteins--deficiencyFemaleHumansLupus Erythematosus, Systemic--bloodMaleMorbidityPrevalence