1. University of Modena and Reggio Emilia; Center for Rare Lung Disease, University of Modena and Reggio Emilia, Modena Italy and Respiratory Disease Section, Department of Oncology, Hematology and Respiratory Disease; Modena Italy
2. University of Modena and Reggio Emilia; Statistics Unit, Department of Oncology, Hematology and Respiratory Disease; Modena Italy
3. Center for Rare Lung Disease, University of Modena and Reggio Emilia, Modena Italy and Respiratory Disease Section, Department of Oncology, Hematology and Respiratory Disease Azienda Ospedaliero-Universitaria di Modena; Modena Italy
4. University of Tasmania; Menzies Research Institute; MS1, 17 Liverpool Street PO Box 23 Hobart Tasmania Australia 7001