THE USEFULNESS OF EARLY CARDIOVASCULAR MAGNETIC RESONANCE IN PATIENTS PRESENTING WITH ACUTE CHEST PAIN, POSITIVE TROPONIN AND NON-OBSTRUCTIVE CORONARY ARTERIES by Ferreira, V, Dall'Armellina, E, Piechnik, S, Karamitsos, T, Francis, J, Choudhury, R, Channon, K, Banning, A, Kharbanda, R, Forfar, C, Ormerod, O, Prendergast, B, Kardos, A, Basagiannia, C, Newton, J, Friedrich, M, Robson, M, Neubauer, S