Disease activity as a major risk factor for osteonercrosis in early systemic lupus erythematosus - Fialho, S. C. M. S; Bonfá, Eloísa Silva Dutra de Oliveira; Vitule, L. F; D'Amico, E; Caparbo, Valeria de Falco; Gualandro, Sandra Fátima Menosi; Pereira, Rosa Maria Rodrigues (Lupus, 2007)