Antiphospholipid antibodies and the antiphospholipid syndrome in systemic lupus erytthematosus. A prospective analysis of 500 consecutive patients - Alarcon-Segovia, D; Deleze, M; Oria, CV; Sanchez-Guerrero, J; Gomez-Pacheco, L; Cabiedes, J; Fernandez, L; Ponce de Leon, S (Medicine (Baltimore), 1989)