Yusuf SW, Ali SS, Swafford J, Durand JB, Bodey GP, Chemaly RF, Kontoyiannis DP, Tarrand J, Rolston KV, Yeh E, Raad II, Safdar A. Culture-positive and culture-negative endocarditis in patients with cancer: a retrospective observational study, 1994-2004. Medicine (Baltimore). 2006 Mar; 85(2):86-94.