Layer-specific strain in patients with heart failure using cardiovascular magnetic resonance: not all layers are the same oleh Lingyu Xu, Joseph J. Pagano, Mark J. Haykowksy, Justin A. Ezekowitz, Gavin Y. Oudit, Yoko Mikami, Andrew Howarth, James A. White, Jason R. B. Dyck, Todd Anderson, D. Ian Paterson, Richard B. Thompson, for the AB HEART Investigators