Kalkanis, A., R.M. Yucel, and M.A. Judson. “The Internal Consistency of PRO Fatigue Instruments in Sarcoidosis: Superiority of the PFI over the FAS”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases 30, no. 1 (April 1, 2013): 60–64. Accessed January 31, 2025. https://mattioli1885journals.com/index.php/sarcoidosis/article/view/2769.