1. Monash Lung and Sleep, Monash Health, Clayton, Victoria, Australia
2. Department of Palliative Care, The Royal Melbourne Hospital, Parkville, Victoria, Australia
3. Department of Palliative Care, Department of Medicine, Victorian Comprehensive Cancer Centre, The Royal Melbourne Hospital, Parkville, Victoria, Australia
4. Department of General Practice, The University of Melbourne, Parkville, Victoria, Australia
5. Department of Respiratory and Sleep Medicine, The Royal Melbourne Hospital, Parkville, Victoria, Australia
6. Department of Medicine, Royal Melbourne Hospital, University of Melbourne, Parkville, Victoria, Australia