Improved cellular uptake of perfluorocarbon nanoparticles for in vivo murine cardiac 19F MRS/MRI and temporal tracking of progenitor cells by Constantinides, C, McNeill, E, Carnicer, R, Al Haj Zen, A, Sainz-Urruela, R, Shaw, A, Patel, J, Swider, E, Alonaizan, R, Potamiti, L, Hadjisavvas, A, Padilla-Parra, S, Kyriacou, K, Srinivas, M, Carr, C