1. Department of Anaesthesiology, Surgical Services and Intensive Care Medicine; Karolinska University Hospital; Solna Sweden
2. Department of Physiology and Pharmacology; Karolinska Institutet; Stockholm Sweden
3. Maquet Critical Care AB; Solna Sweden
4. Department of Surgical Sciences; Section of Anaesthesiology and Critical Care; Hedenstierna's Laboratory; Uppsala University; Uppsala Sweden
5. CIBERES; CIBER de enfermedades respiratorias; Instituto Carlos III; Madrid Spain