1 National Heart and Lung Institute, Imperial College, Guy Scadding Building, Royal Brompton Campus, London SW3 6LY, UK; Interstitial Lung Disease Unit, Royal Brompton Hospital, London, UK. Electronic address: [email protected].
2 National Heart and Lung Institute, Imperial College, Guy Scadding Building, Royal Brompton Campus, London SW3 6LY, UK; Interstitial Lung Disease Unit, Royal Brompton Hospital, London, UK.