To minimize bias potential for confounding variables , LEVANT 2 ( 1 ) excluded patients stented after predilation before randomization , ( 2 ) incorporated very stringent criteria for bailout stenting , ( 3 ) did not count bailout stenting as a target lesion revascularization or failure of any end point , ( 4 ) required a blinded clinician to perform clinical evaluations at follow-up , and ( 5 ) required clinical assessment before review of duplex ultrasound results .