1. Dr, Division of Population and Behavioural Sciences, School of Medicine, University of St Andrews, North Haugh, St Andrews, Scotland, KY16 9TF, UK
2. Professor, UCD Centre for Interdisciplinary Research, Education and Innovation in Health Systems (UCD IRIS), UCD School of Nursing, Midwifery and Health Systems, UCD Health Sciences Centre, University College Dublin (UCD), Dublin, Ireland
3. Professor, Nursing Directorate, Imperial College Healthcare NHS Trust, Charing Cross Hospital, London, UK