To address the secondary aims, relationships between complication rates and stent type will be examined by the chi-square or the exact Fisher tests. Logistic regression will be used to compare stent complication rates adjusted for important potential confounders. Health-related quality of life (HRQL) will be evaluated by a paired t-test to determine the impact of stent placement (i.e. compare baseline HRQL and month 3 HRQL) by Student's t -test to compare the differences in HRQL at baseline and 3 months between study groups. Linear regression models will be constructed to assess HQRL while adjusting for factors other than stent type. Total direct costs for each study group will be compared and cost effectiveness modelled.