[1] Washington Hosp Ctr, Washington, DC 20010 USA
[2] Columbia Univ, Cardiovasc Res Fdn, New York, NY USA
[3] Maine Med Ctr, Portland, ME 04102 USA
[4] Univ Hosp Bern, CH-3010 Bern, Switzerland
[5] Wake Forest Sch Med, Winston Salem, NC USA
[6] Lahey Clin Med Ctr, Burlington, MA 01803 USA
[7] St Lukes Mid Amer Heart Inst, Kansas City, MO USA
[8] Miriam Hosp, Providence, RI 02906 USA