Athol U Wells1, Katerina M Antoniou2. 1. The Interstitial Lung Disease Unit, Royal Brompton Hospital, Royal Brompton & Harefield NHS Foundation Trust, London, England. Electronic address: athol.wells@rbht.nhs.uk. 2. Department of Thoracic Medicine & Laboratory of Cellular and Molecular Pneumonology, Medical School, University of Crete, Crete, Greece.