Perioperative myocardial ischemia in patients undergoing noncardiac surgery--II: incidence and severity during the 1st week after surgery - Mangano, D T; Wong, M G; London, M J; Tubau, J F; Rapp, J A (J Am Coll Cardiol, 1991)
; The Study of Perioperative Ischemia (SPI) Research Group.