W. de Kleijn, M. Elfferich, and J. De Vries, et al., “Fatigue in sarcoidosis: American versus Dutch patients”, Sarcoidosis Vasc Diffuse Lung Dis, vol. 26, no. 2, pp. 92–97, Dec. 2009, Accessed: Jan. 19, 2026. [Online]. Available: https://mattioli1885journals.com/index.php/sarcoidosis/article/view/2595