In this randomized clinical trial , 120 patients with a mean age of 23.60 10.99 years ( range 12 to 58 years , 79 men ) , with post-ductal , short-segment , severe native CoA underwent implantation of bare Cheatham-Platinum ( bCP ) ( n = 60 ) or covered Cheatham-Platinum ( cCP ) ( n = 60 ) stents .