[1] St Michaels Hosp, Cardiac Surg, Toronto, ON, Canada
[2] Univ Toronto, Toronto, ON, Canada
[3] Swansea Univ, Swansea, W Glam, Wales
[4] Univ North Carolina Hosp, Chapel Hill, NC USA
[5] HCA Midwest Hlth Heart & Vasc Inst, Kansas City, MO USA
[6] RUB, Bochum, Germany
[7] Novo Nordisk AS, Soborg, Denmark
[8] Harvard Med Sch, Boston, MA 02115 USA