1 Department of Critical Care, King's College Hospital, London, UK. avkwong@mac.com.
2 Anesthesia and Intensive Care, Ospedale Policlinico San Martino, IRCCS Per L'Oncologia e le Neuroscienze, Genoa, Italy.
3 Italy and Department of Surgical Sciences and Integrated Diagnostics (DISC), Genoa, Italy.
4 Division of Pulmonary, Critical Care and Sleep Medicine, Northwell Health LIJ/NSUH Medical Center, Zucker School of Medicine, Hofstra/Northwell, Hempstead, USA.