“A Prospective Clinical Multicentre Study on Adult Pulmonary Langerhans’ Cell Histiocytosis”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases, vol. 29, no. 2, Dec. 2012, pp. 132-8, https://mattioli1885journals.com/index.php/sarcoidosis/article/view/2508.