[1] Harvard Univ, Harvard T H Chan Sch Publ Hlth, Boston, MA USA
[2] Univ Hosp Dusseldorf, Dept Cardiol Pulmonol & Vasc Med, Dusseldorf, Germany
[3] Massachusetts Gen Hosp, Dept Radiol, Boston, MA USA
[4] Massachusetts Gen Hosp, Cardiovasc Imaging Res Ctr, Boston, MA USA
[5] Harvard Med Sch, Massachusetts Gen Hosp, Cardiol Div, Dept Med, Boston, MA USA
[6] Univ Hosp Dusseldorf, Dept Cardiol & Vasc Med, Moorenstr 5, D-40225 Dusseldorf, Germany