Diagnostic performance of perfusion cardiovascular magnetic resonance compared with gated myocardial perfusion spect in patients with known or suspected coronary artery disease by Prasad Sanjay, Symmonds Karen, Roughton Micheal, Gatehouse Peter, Watkins Stuart, Petryka Joanna, Assomull Ravi, Reyes Eliana, Bucciarelli-Ducci Chiara, Lyne Jonathan, Underwood Richard, Pennell Dudley