MPO and coronary artery disorder: CAD; coronary artery disease; AHA: American Heart Association; hs-CRP: highly-sensitive C-reactive protein; PCI; percutaneous coronary intervention; LDL-C: low-density lipoprotein cholesterol; CARDIA: Coronary Artery Risk Development in Young Adults; MPO: myeloperoxidase; MMP: metalloproteinase