Auto-antibodies to α2-glycoprotein I in systemic lupus erythematosus and primary antiphopsholipid antibody syndrome: clinical correlations in comparison with other antiphospholipid antibody test. - Day, HM; Thiagarajan, P; Ahn, C; Reveilee, JD; Tinker, KF; Arnett, FC (J Rheumatol, 1998)