Acquired activated protein C resistance is associated with the co-existence of anti-pro-thrombin antibodies and lupus anticoagulant activity in patients with systemic lupus erythematosus - Nojima, J; Kuratsune, H; Suehisa, E; Kawasaki, T; Machii, T; Kitani, T; Iwatani, Y; Kanakura, Y (Br J Haematol, 2002)