1. Centre for Advanced Studies in Nursing (CASN), Centre of Academic Primary Care, University of Aberdeen, Foresterhill Health Centre, Westburn Road, Aberdeen AB25 2AY, Scotland
2. Northumbria University School of Health, Community & Education Studies, Room H215, Coach Lane Campus West, Newcastle upon Tyne, NE7 7XA, UK
3. Health & Social Care Institute, Teesside University, Middlesbrough, TS1 3BA, UK
4. Health Economics Research Unit, Institute of Applied Health Sciences, University of Aberdeen, Aberdeen, AB25 2ZD, UK
5. Centre of Academic Primary Care, University of Aberdeen, Foresterhill Health Centre, Westburn Road, Aberdeen, AB25 2AY, Scotland, UK