1. Health Services Research Unit, University of Aberdeen, Aberdeen, UK
2. Nursing, Midwifery and Allied Health Professionals Research Unit, Glasgow Caledonian University, Glasgow, UK
3. Aberdeen Royal Infirmary, Aberdeen, UK
4. Derriford Hospital, Plymouth, UK
5. St Mary’s Hospital, Manchester, UK
6. Patient representative, Aberdeen, UK
7. Health Economics Research Unit, University of Aberdeen, Aberdeen, UK