1. From the Section of Advanced Heart Failure and Transplantation, University of Colorado School of Medicine, Aurora, CO (L.A.A.); Oxford PharmaGenesis Inc., Newtown, PA ( K.E.S.T.); Truven Health Analytics, Inc., Washington, DC (D.M.S., K.L.W.); and Amgen, Inc., Thousand Oaks, CA (I.A.).