1. Department of Pulmonary Diseases, University Medical Center Groningen, Groningen, The Netherlands
2. Department of Pathology, Antwerp University Hospital, Edegem, Belgium
3. Department of Pulmonology and Thoracic Oncology, European Reference Network for Rare or Low Prevalence Lung Diseases: ERN-LUNG, Antwerp University Hospital, Belgium and University of Antwerp, Edegem, Belgium