J. C. R. Iglezias, L. A. O. Dallan, A. Lourenção Jr., A. L. Celullare, R. Pereira, and N. A. G. Stolf, “ Degree of risk related to procedures performed in conjunction with surgical myocardial revascularization in octogenarians ”, Clinics, vol. 64, no. 5, pp. 387–392, May 2009, doi: 10.1590/S1807-59322009000500003.