In the stent group, primary stenting without predilation was performed except in patients with very tight stenoses or heavily calcified lesions that did not allow primary passage with the stent introducer device. Stents were implanted to extend 10 mm proximal and distal to the margins of the target lesion. When multiple stents were required, the margins of the stents were overlapped for 10 mm. Postdilation after stenting was performed strictly within the stented segment with up to 10% oversizing of the post-dilation balloon.