For the purpose of the study, the participants need to take antiplatelet drugs ("blood thinners") that are necessary to prevent formation of clot in the stent. This is a standard precaution for every stent procedure. The participants will take two drugs (called aspirin and Plavix) for 1 month and then aspirin alone for 11 more months (total time on aspirin is 12 months). It is essential that the drugs are taken every day as prescribed. As these drugs are dangerous during pregnancy, if the participant is a woman of childbearing age, then should discuss this issue with her physician, and avoid becoming pregnant during the 12 months that you need these drugs.