Kalkanis, Alexandros, et al. “Reticuloendothelial System Involvement in Untreated Sarcoidosis Patients As Assessed by 18F-FDG PET Scanning”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases, vol. 33, no. 4, Dec. 2016, pp. 423-5, https://mattioli1885journals.com/index.php/sarcoidosis/article/view/5502.