1 Department of Critical Care Medicine, Guy's and St Thomas, NHS Foundation Trust, St Thomas' Hospital, Westminster Bridge Road, London, UK. [email protected].
2 Department of Critical Care Medicine, Guy's and St Thomas, NHS Foundation Trust, St Thomas' Hospital, Westminster Bridge Road, London, UK.
3 Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, King's College London, London, UK.
4 Department of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy.
5 Department of Anesthesia and Intensive Care Medicine, Niguarda Ca' Granda, Milan, Italy.