1. Department of Respiratory Medicine, The Northern Hospital, Melbourne, Australia
2. School of Medicine, Health Sciences, Dentistry, University of Melbourne, Melbourne, Australia
3. Norwice Medical School, University of East Anglia, Norwich, Norfolk, United Kingdom
4. Norwice Medical School, Norfolk and Norwich University Hospital NHS Foundation Trust, Norwich, Norfolk, United Kingdom
5. Department of Pulmonary Physiology and Sleep Medicine, Sir Charles Gairdner Hospital, Perth, Australia
6. School of Human Sciences, University of Western Australia, Perth, Australia
7. West Australian Sleep Disorders Research Institute, Perth, Australia