van Manen, Mirjam J. G., et al. “Validation of the King’s Sarcoidosis Questionnaire (KSQ) in a Dutch Sarcoidosis Population”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases, vol. 33, no. 1, Mar. 2016, pp. 75-82, https://mattioli1885journals.com/index.php/sarcoidosis/article/view/4665.