In search for the Holy Grail: suggestions for studies to define delta changes to diagnose or exclude acute myocardial infarction : a position paper from the study group on biomarkers of the Acute Cardiovascular Care Association - Jaffe, Allan S.; Möckel, Martin; Giannitsis, Evangelos; Huber, Kurt; Mair, Johannes; Mueller, Christian; Plebani, Mario; Thygesen, Kristian; Lindahl, Bertil (European heart journal - acute cardiovascular care, 2014)