CST3 and congestive heart failure: Age, gender, DM, Killip class, admission heart rate, admission SBP, history of congestive heart failure, peripheral arterial disease, cystatin C, previous MI, previous PCI, previous CABG, randomized treatment arm (ticagrelor/clopidogrel), extent of CAD, NT‐proBNP, cTnT‐hs