Hofland, Regina W, Steven FT Thijsen, John Bouwman, Myrtle van der Wel, and Ailko WJ Bossink. “Sarcoidosis and Purified Protein Derivative Reactivity”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases 31, no. 2 (July 8, 2014): 142–148. Accessed February 22, 2025. https://mattioli1885journals.com/index.php/sarcoidosis/article/view/2894.