Composite efficacy failure was defined as Biopsy Proven Acute Rejection(BPAR) of International Society for Heart and Lung Transplantation(ISHLT) grade ≥3A, Acute Rejection associated with Hemodynamic Compromise, Graft loss/Retransplant, Death or Loss to follow-up. Identification of acute rejection was based on the local pathologist's evaluation of endomyocardial biopsy slides. Hemodynamic compromise was present if 1 or more of the following were met: Ejection fraction ≤30% or 25% lower than Baseline or Fractional shortening ≤20% or 25% lower than Baseline and/or use of inotropic treatment.