To minimize bias potential for confounding variables , LEVANT @ ( @ ) excluded patients stented after predilation before randomization , ( @ ) incorporated very stringent criteria for bailout stenting , ( @ ) did not count bailout stenting as a target lesion revascularization or failure of any end point , ( @ ) required a blinded clinician to perform clinical evaluations at follow-up , and ( @ ) required clinical assessment before review of duplex ultrasound results .