Strookappe, Bert, et al. “Benefits of Physical Training in Patients With Idiopathic or End-Stage Sarcoidosis-Related Pulmonary Fibrosis: A Pilot Study”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases, vol. 32, no. 1, June 2015, pp. 43-52, https://mattioli1885journals.com/index.php/sarcoidosis/article/view/3779.