1 Department of Respiratory Medicine, National Reference Center for Rare Pulmonary Diseases, Louis Pradel Hospital, University of Lyon, Lyon, France. Electronic address: vincent.cottin@chu-lyon.fr.
2 Department of Respiratory Medicine, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.
3 Department of Diseases of the Thorax, Ospedale GB Morgagni, and Department of Respiratory Diseases & Allergy, Aarhus University Hospital, Aarhus, Denmark.
4 Center for Interstitial and Rare Lung Diseases, University of Heidelberg, Heidelberg, Germany.
5 Royal Prince Alfred Hospital and University of Sydney, Sydney, Australia.
6 Clinica di Malattie del Apparato Respiratorio, Università degli Studi di Padova, Padova, Italy.