1. Faculty of Health Sciences, University of Southampton, Hampshire, UK (Associate Prof Portillo)
2. Intensive Care Unit, Clinica Universidad de Navarra, Pamplona, Spain (Ms Regaira)
3. School of Nursing, University of Navarra, Pamplona, Spain (Dr Pumar, Dr Mujika)
4. Faculty of Health Sciences, NIHR Wessex CLAHRC, University of Southampton, Hampshire, UK (Dr Vassilev, Prof Rogers, Prof Kennedy)
5. Radboud University Medical Centre, Radboud Institute for Health Sciences, Nijmegen, the Netherlands (Prof Wensing, Mr Koetsenruijter)