[1] Leipzig Heart Ctr, Univ Dept Cardiac Surg, Leipzig, Germany
[2] Lankenau Heart Inst, Dept Cardiac Surg, Wynnewood, PA USA
[3] Lankenau Inst Med Res, Dept Cardiac Surg Res, Wynnewood, PA USA
[4] Univ Hlth Network, Toronto Gen Hosp, Peter Munk Cardiac Ctr, Div Cardiovasc Surg, 200 Elizabeth St, Toronto, ON, Canada
[5] Univ Toronto, Dept Surg, Toronto, ON, Canada