Marcellis, R., M. van der Veeke, I. Mesters, M. Drent, R. de Bie, G. de Vries, and A. Lenssen. “Does Physical Training Reduce Fatigue in Sarcoidosis?”. Sarcoidosis, Vasculitis and Diffuse Lung Disease, vol. 32, no. 1, June 2015, pp. 53-62, https://mattioli1885journals.com/index.php/sarcoidosis/article/view/4053.