Arning, Erland, Brian D Lowes, Matthew RG Taylor, Xingli Meng, Raphael Schiffmann, and Teodoro Bottiglieri. “Tetrahydrobiopterin Concentrations in Normal and Coronary Artery Diseased Heart Tissue”. Journal of Cardiovascular Medicine and Cardiology 3, no. 1 (May 6, 2016): 014–017. Accessed September 20, 2024. https://www.organscigroup.com/jcmc/article/view/JCMC-3-123.