Smith DA, Zouridakis EG, Mariani M, Fredericks S, Cole D, Kaski JC. Neopterin levels in patients with coronary artery disease are independent of Chlamydia pneumoniae seropositivity. Am Heart J. 2003 Jul;146(1):69–74. doi: 10.1016/s0002-8703(03)00101-7. PMID: 12851610.