Focal myocardial fibrosis detected with magnetic resonance late Gadolinium enhancement imaging and diffuse interstitial fibrosis determined with histological staining of endomyocardial biopsy specimens in patients with non-ischemic left ventricular systolic dysfunction: two distinct entities? - Leiner Tim; Waltenberger Johannes; van Suylen Robert J; Dennert Robert; Bekkers Sebastiaan; Schalla Simon; Heymans Stephane (Journal of Cardiovascular Magnetic Resonance, 2009)