J. Marcoval and J. Mañá, “Papular sarcoidosis of the knees. A frequent form of presentation of systemic sarcoidosis”, Sarcoidosis Vasc Diffuse Lung Dis, vol. 33, no. 1, pp. 59–65, Mar. 2016, Accessed: Aug. 21, 2025. [Online]. Available: https://mail.mattioli1885journals.com/index.php/sarcoidosis/article/view/4256