Comment on

• 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.

  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, Casabé J, Chipigina N, Eisen DP, Spelman D, Delahaye F, Peterson G, Olaison L, Wang A; International Collaboration on Endocarditis-Prospective Cohort Study (ICE-PCS) Investigators. Lalani T, et al. Circulation. 2010 Mar 2;121(8):1005-13. doi: 10.1161/CIRCULATIONAHA.109.864488. Epub 2010 Feb 16. Circulation. 2010. PMID: 20159831 Free PMC article.