Health care-associated native valve endocarditis: importance of non- nosocomial acquisition [published correction appears in Ann Intern Med. 2010;152:480]. Ann Intern Med. 2009;150:586 594. doi: 10. Lalani T, Cabell CH, Benjamin DK, Lasca O, Naber C, Fowler VG Jr, Corey GR, Chu VH, Fenely M, Pachirat O, Tan RS, Watkin R, Ionac A, Moreno A, Mestres CA, Casab J, Chipigina N, Eisen DP, Spelman D, Delahaye F, Peterson G, Olaison L,WangA; International Collaboration on Endocarditis-Prospective Cohort Study (ICE-PCS) Investigators. Analysis of the impact of early surgery on in-hospital mortality of native valve endocarditis: use of propensity score and instrumental variable methods to adjust for treatment-selection bias. Circulation. 2010;121:1005 1013. doi: 10.1161/CIRCULATIONAHA.109.864488. 11. Kiefer T, Park L, Tribouilloy C, Cortes C, Casillo R, Chu V, Delahaye F, Durante-Mangoni E, Edathodu J, Falces C, Logar M, Mir JM, Naber C, Tripodi MF, Murdoch DR, Moreillon P, Utili R, Wang A. Association between valvular surgery and mortality among patients with infective endocarditis complicated by heart failure. JAMA. 2011;306:2239 2247. doi: 10.1001/jama.2011.1701. 12. Baddour LM, Wilson WR, Bayer AS, Fowler VG Jr, Bolger AF, Levison ME, Ferrieri P, Gerber MA, Tani LY, Gewitz MH, Tong DC, Steckelberg JM, Baltimore RS, Shulman ST, Burns JC, Falace DA, Newburger JW, Pallasch TJ, Takahashi M, Taubert KA. Infective endocarditis: diagno- sis, antimicrobial therapy, and management of complications: a state- ment for healthcare professionals from the Committee on Rheumatic Fever, Endocarditis, and Kawasaki Disease, Council on Cardiovascular Disease in the Young, and the Councils on Clinical Cardiology, Stroke, and Cardiovascular Surgery and Anesthesia, American Heart Association [published correction appears in Circulation. 2007;115:e408; Circulation. 2007;116:e547; Circulation. 2005;112:2373; Circulation. CIRCULATIONAHA.105.165564. 13. 