1. Pain Management Service, HammondCare, Sydney, NSW 2000, Australia
2. Pain Medicine, Sydney Medical School-Northern, The University of Sydney, Sydney, Australia
3. Greenwich Hospital, Greenwich, NSW 2065, Australia
4. State Spinal Cord Injury Service, NSW Agency for Clinical Innovation, Chatswood, NSW 2057, Australia
5. John Walsh Centre for Rehabilitation Research, Sydney Medical School-Northern, The University of Sydney, Sydney, Australia