1. West Australian Sleep Disorders Research Institute, Queen Elizabeth II Medical Centre, Nedlands, Western Australia
2. Department of Pulmonary Physiology and Sleep Medicine, Sir Charles Gairdner Hospital, Nedlands, Western Australia
3. Busselton Population Medical Research Institute, Sir Charles Gairdner Hospital, Nedlands, Western Australia
4. School of Population and Global Health, The University of Western Australia, Nedlands, Western Australia
5. PathWest Laboratory Medicine of Washington, Queen Elizabeth II Medical Centre, Nedlands, Western Australia
6. School of Medicine and Pharmacology, The University of Western Australia, Nedlands, Western Australia; *Contributed equally