1. School of Medical and Health Sciences, Bangor University, Bangor, Wales, UK
2. Centre for Ageing and Dementia Research (CADR), Dementia Services Development Centre (DSDC) Wales Research Centre, School of Medical and Health Sciences, Bangor University, Bangor, Wales, UK
3. Centre for Health Economics and Medicines Evaluation (CHEME), Bangor University, Bangor, Wales, UK