Rationale and study design of the MINERVA study: Multicentre Investigation of Novel Electrocardiogram Risk markers in Ventricular Arrhythmia prediction-UK multicentre collaboration by Ng, GA, Mistry, A, Newton, M, Schlindwein, FS, Barr, C, Bates, MG, Caldwell, J, Das, M, Farooq, M, Herring, N, Lambiase, P, Osman, F, Sohal, M, Staniforth, A, Tayebjee, M, Tomlinson, D, Whinnett, Z, Yue, A, Nicolson, WB