P56 Coronary artery calcification in Danish SLE patients without known cardiovascular disease: comparison with the general population, myositis and diabetes patients by Søren Jacobsen, Jess Lambrechtsen, Flemming Hald Steffensen, Hans Mickley, Anne Voss, Louise P Diederichsen, Jacob Hjelmborg, Susan Due Kay, Axel CP Diederichsen, Mikael Kjær Poulsen, Niels Peter Sand, Jes Lindholt