aWarwick Clinical Trials Unit, University of Warwick, Coventry

bRoyal United Hospital, Bath

cSouthmead Hospital, North Bristol NHS Trust, Bristol, UK

Correspondence to Jerry P. Nolan, FRCA, FFICM, FRCP, FRCEM (Hon), Professor of Resuscitation Medicine, Warwick Clinical Trials Unit, University of Warwick, Consultant in Anaesthesia and Intensive Care Medicine, Royal United Hospital, Bath BA1 3NG, UK. E-mail: [email protected]