[1] Harvard Med Sch, Massachusetts Gen Hosp, Boston, MA USA
[2] Duke Clin Res Inst, Durham, England
[3] MedStar Washington Hosp Ctr, Washington, DC USA
[4] Heart Hosp Baylor Plano, Plano, TX USA
[5] Massachusetts Gen Hosp, Boston, MA 02114 USA
[6] MGH, Boston, MA USA
[7] Duke Univ, Med Ctr, Durham, NC USA