Adaptive Servo-Ventilation for Central Sleep Apnea in Systolic Heart Failure - Cowie, MR; Woehrle, H; Wegscheider, K; Angermann, C; d’Ortho, MP; Erdmann, E; Levy, P; Simonds, AK; Somers, VK; Zannad, F; Teschler, H (N Engl J Med, 2015)