1. College of Medicine and Public Health, Flinders University, Adelaide, SA, Australia, Department of Physical Therapy, College of Applied Medical Sciences, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
2. College of Medicine and Public Health, Flinders University, Adelaide, SA, Australia
3. College of Medicine and Public Health, Flinders University, Adelaide, SA, Australia, Southern Adelaide Local Health Network, Department of Respiratory & Sleep Medicine, Adelaide, SA, Australia
4. Department of Statistics, Data Science and Epidemiology, Swinburne University, Melbourne, VIC, Australia
5. Department of Medicine, College of Medicine, King Saud bin Abdulaziz University for Health Sciences, Saudi Arabia
6. College of Medicine and Public Health, Flinders University, Adelaide, SA, Australia, Southern Adelaide Local Health Network, Sleep Health Service, Adelaide, SA, Australia, prof_, Email: pt2006@hotmail.com