Subgroup analysis of a randomized controlled trial evaluating the safety and efficacy of cardiac contractility modulation in advanced heart failure

William T. Abraham, Koonlawee Nademanee, Kent Volosin, Steven Krueger, Suresh Neelagaru, Nirav Raval, Owen Obel, Stanislav Weiner, Marc Wish, Peter Carson, Kenneth Ellenbogen, Robert Bourge, Michael Parides, Richard P. Chiacchierini, Rochelle Goldsmith, Sidney Goldstein, Yuval Mika, Daniel Burkhoff, Alan Kadish