1 Division of Cardiology, University of Alberta, Edmonton, Alberta, Canada.
2 Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota, USA.
3 Section of Cardiovascular Medicine, Yale University, New Haven, Connecticut, USA.
4 Warren Alpert Medical School of Brown University and Brown University Health Cardiovascular Institute, Providence, Rhode Island, USA.
5 Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
6 Department of Critical Care Medicine, University of Alberta, and Alberta Health Services, Edmonton, Alberta, Canada.
7 Division of Cardiology, University of Alberta, Edmonton, Alberta, Canada; Department of Critical Care Medicine, University of Alberta, and Alberta Health Services, Edmonton, Alberta, Canada. Electronic address: [email protected].