Biller, H., et al. “Gene Polymorphisms of ACE and the Angiotensin Receptor AT2R1 Influence Serum ACE Levels in Sarcoidosis”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases, vol. 26, no. 2, Dec. 2009, pp. 139-46, https://mattioli1885journals.com/index.php/sarcoidosis/article/view/2600.