[1] Univ Pernambuco, Div Cardiovasc Surg, Pronto Socorro Cardiol Pernambuco PROCAPE, Recife, PE, Brazil
[2] Univ Fed Sao Paulo, Escola Paulista Med, Div Cardiac Surg, Sao Paulo, Brazil
[3] Katholieke Univ Leuven, Univ Hosp Leuven, Res Unit Cardiac Surg, Dept Cardiovasc Dis, Herestr 49, B-3000 Leuven, Belgium
[4] Katholieke Univ Leuven, Dept Cardiovasc Sci, Herestr 49, B-3000 Leuven, Belgium
[5] Univ Fed Uberlandia, Dept Clin Res, Uberlandia, MG, Brazil
[6] Queens Univ, Div Cardiac Surg, Toronto, ON, Canada
[7] Univ Toronto, Div Cardiac Surg, Toronto, ON, Canada
[8] Univ Washington, Div Cardiol, Washington, DC USA
[9] West German Heart & Vasc Ctr, Dept Thorac & Cardiovasc Surg, Essen, Germany