Calibration of myocardial iron concentration against T2-star Cardiovascular Magnetic Resonance by Firmin David N, Black Greg, House Mike, Fleming Adam, Fucharoen Suthat, Catani Gualtiero, Forni Gianluca, Galanello Renzo, Wood John, Porter John B, Anderson Lisa J, Kirk Paul, He Taigang, Carpenter John-Paul, St Pierre Timothy G, Pennell Dudley J