LPA and coronary artery disorder: Since we focussed on the apoB component in Lp(a) in an analysis that did not select SNPs on the basis on their linkage to apo(a) size, we are, on the one hand, unable to distinguish differences in the association of Lp(a) particles carrying apo(a) isoforms of varying length (kringle 4 copy number) with CHD risk.