1 Department of Critical Care Medicine, Sunnybrook Health Science Centre, Toronto, Ontario, Canada; Department of Medicine, University of Toronto, Toronto, Ontario, Canada. Electronic address: varinder.randhawa@gmail.com.
2 Department of Cardiology, Mazankowski Alberta Heart Institute and University of Alberta, Edmonton, Alberta, Canada.
3 Harrington Heart Vascular Institute, University Hospitals, Cleveland, Ohio, USA; Case Western Reserve University, Cleveland, Ohio, USA.
4 Department of Cardiac Surgery, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada; Department of Medicine, University of Toronto, Toronto, Ontario, Canada.