A total of @ patients with @ intermediate coronary artery lesions ( stenosis of @ % -@ % ) confirmed by coronary angiography were randomized into @ groups to undergo PCI for a minimal lumen cross sectional area ( MLA ) < @ mm ( @ ) ( IVUS group , @ lesions ) or for a FFR < @ ( FFR group , @ lesions ) , or to receive standard medical treatment ( medication group , @ lesions ) .