1. Department of Pulmonary Physiology & Sleep Medicine, Sir Charles Gairdner Hospital , Nedlands, WA , Australia
2. Faculty of Human Sciences, University of Western Australia , Crawley, WA , Australia
3. West Australian Sleep Disorders Research Institute, QEII Medical Centre , Nedlands, WA , Australia
4. Division of Medical Informatics, Department of Internal Medicine, University of Kansas Medical Center , Kansas City, KS , USA
5. Division of Pulmonary Critical Care and Sleep Medicine, Department of Internal Medicine, University of Kansas Medical Center , Kansas City, KS , USA