Pulmonary fibrosis: "idiopathic" is not "cryptogenic"

Affiliations

• ¹ Interstitial Lung Disease Unit, Royal Brompton Hospital, London, UK [email protected].
• ² National Jewish Health, Denver, CO, USA.
• ³ University of Michigan Health System, Ann Arbor, MI, USA.
• ⁴ Dept of Respiratory Medicine, Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada.
• ⁵ Division of Pulmonary, Allergy and Critical Care Medicine, University of Alabama at Birmingham, Birmingham, AL, USA.