Blood (about 2 tablespoons) will be drawn at Weeks 1, 3, 5, 8, 12, 24, 36, and 48 for tests that measure whether a certain gene is expressed or not and to check participant's immune system function. Blood (about 2 tablespoons) will be drawn before participant has surgery and at Weeks 12, 24, 36, and 48. If participant is taken off the study early, participant will have this blood drawn at that time as well.