In vivo tracking and 1H/19F magnetic resonance imaging of biodegradable polyhydroxyalkanoate/polycaprolactone blend scaffolds seeded with labeled cardiac stem cells by Constantinides, C, Basnett, P, Lukasiewicz, B, Carnicer, R, Swider, E, Majid, Q, Srinivas, M, Carr, C, Roy, I