In this HEBE trial substudy , which was approved by the institutional review board ( trial registry number ISRCTN95796863 ) , the authors assessed the effects of intracoronary infusion with bone marrow-derived mononuclear cells ( BMMCs ) or peripheral blood-derived mononuclear cells ( PBMCs ) on myocardial perfusion recovery by using cardiac magnetic resonance ( MR ) imaging after revascularization .