1. Population Health Sciences Institute, Faculty of Medical Sciences, Newcastle University, Sir James Spence Institute, Royal Victoria Infirmary, Newcastle upon Tyne NE1 4LP, UK
2. Fuse–UKCRC Centre for Translational Research in Public Health, Newcastle upon Tyne NE2 4HH, UK
3. Department of Anthropology, Durham University, Durham DH1 3LE, UK
4. Division of Health Research, Faculty of Health & Medicine, Lancaster University, Lancaster LA1 4YG, UK