Paul W M Fedak1, David G Guzzardi2. 1. Department of Cardiac Sciences, Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Canada; Bluhm Cardiovascular Institute, Northwestern University, Chicago, Ill. Electronic address: paul.fedak@gmail.com. 2. Department of Cardiac Sciences, Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Canada.