- Adequate blood clotting as defined by international normalized ratio (INR) and activated partial thromboplastin time (aPTT) ≤ 1.5 times ULN (patients on anticoagulation with an agent such as warfarin or heparin or rivoraxaban will be allowed to participate provided that no prior evidence of underlying abnormality in these parameters exists). For patients on warfarin, close monitoring of at least weekly evaluations will be performed until INR is stable based on a measurement at pre-dose, as defined by the local standard of care