1. Academic Centre for Interstitial Lung Diseases, Erasmus University Medical Centre Rotterdam, Rotterdam, the Netherlands
2. Department of Physiotherapy, Alfred Health, Melbourne, Australia
3. Discipline of Physiotherapy, La Trobe University, Melbourne, Australia
4. Institute for Breathing and Sleep, Melbourne, Australia
5. Interstitial Lung Disease Program, National Jewish Health, Denver, Colorado; and
6. Interstitial Lung Disease Unit, Royal Brompton Hospital, Imperial College, London, United Kingdom