Agabiti, Nera, et al. “Idiopathic Pulmonary Fibrosis (IPF) Incidence and Prevalence in Italy”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases, vol. 31, no. 3, Oct. 2014, pp. 191-7, https://mattioli1885journals.com/index.php/sarcoidosis/article/view/3695.