[1] Northern Ontario Sch Med Univ NOSMU, Thunder Bay Reg Hlth Sci Ctr, Dept Cardiol, Thunder Bay, ON, Canada
[2] Univ Otago Wellington, Wellington Hosp, Dept Med, Wellington, New Zealand
[3] Cleveland Clin, Dept Thorac & Cardiovasc Surg, Cleveland, OH USA
[4] Cumming Sch Med, Libin Cardiovasc Inst, Calgary, AB, Canada
[5] Univ Sydney, Nepean Hosp, Dept Cardiol, Sydney, NSW, Australia