1. Division of Nursing, Midwifery and Social Work, The University of Manchester, Manchester, UK
2. Faculty of Biology, Medicine and Health, Division of Nursing, Midwifery and Social Work, The University of Manchester, Manchester, UK
3. Faculty of Economics and Business, University of Groningen, Groningen, The Netherlands
4. Institute of Health & Society and Institute for Ageing, Newcastle University, Newcastle upon Tyne, UK