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Klein L, O'Connor CM, Leimberger JD, Gattis-Stough W, Piña IL, Felker GM, Adams KF Jr, Califf RM, Gheorghiade M; OPTIME-CHF Investigators.Klein L, et al. Among authors: felker gm.Circulation. 2005 May 17;111(19):2454-60. doi: 10.1161/01.CIR.0000165065.82609.3D. Epub 2005 May 2.Circulation. 2005.PMID: 15867182Clinical Trial.