1. St John of God Midland Public and Private Hospital, Midland, Western Australia, Australia
2. Curtin Medical School, Curtin University, Bentley, Western Australia, Australia
3. School of Psychology, Curtin University, Bentley, Western Australia, Australia
4. Department of Respiratory Medicine, Sir Charles Gairdner Hospital, Nedlands, Western Australia, Australia
5. Medical School, University of Western Australia, Nedlands, Western Australia, Australia
6. Department of Respiratory Medicine, Fiona Stanley Hospital, Murdoch, Western Australia, Australia