[1] Harvard Univ, Brigham & Womens Hosp, Sch Med, Div Pharmacoepidemiol & Pharmacoecon, Boston, MA 02115 USA
[2] Harvard Univ, Brigham & Womens Hosp, Sch Med, Div Vasc & Endovasc Surg, Boston, MA 02115 USA
[3] Harvard Univ, Brigham & Womens Hosp, Sch Med, Div Cardiovasc Med, Boston, MA 02115 USA
[4] Duke Clin Res Inst, Durham, NC USA