1. Institute of Applied Health Research, College of Medical and Dental SciencesUniversity of Birmingham UK
2. Department of Sociological Studies, Faculty of Social SciencesUniversity of Sheffield UK
3. The Department of Economics, College of Social SciencesUniversity of Birmingham UK
4. School of Nursing, College of Medical and Dental SciencesUniversity of Birmingham; Birmingham Women's and Children's Hospitals NHS Foundation Trust Birmingham UK