1 Respiratory Medicine Division, Department of Medicine Solna, and Center for Molecular Medicine (CMM), Karolinska Institutet; and Respiratory Medicine, Theme Inflammation and Infection, Karolinska University Hospital, Stockholm, Sweden. Johan.Grunewald@ki.se.
2 Interstitial Lung Diseases Center of Excellence, Department of Pulmonology, St Antonius Hospital, Nieuwegein, Netherlands; and Division of Heart and Lungs, University Medical Center Utrecht, Utrecht, Netherlands.
3 Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden.
4 Scleroderma and Sarcoidosis Patient Care and Research Center, University Medical Center Comprehensive Pulmonary Hypertension Center, Tulane University School of Medicine, New Orleans, LA, USA.
5 Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
6 Department of Pneumology, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.