“…Where needed, there was exemption or approval (and waiver of consent) from the relevant institutional review boards or ethics committees for the transfer of data for this analysis. Two of the studies were conducted at Royal Children's Hospital, Melbourne, Australia [13,15]; one was at University Hospitals, Geneva, Switzerland [14]; another was at Sophia Children's Hospital, Rotterdam, The Netherlands [16]; and another was a multicentre study in the USA (conducted at Emory University, Atlanta, University of Colorado, Denver, and University of Michigan Health Systems, Ann Arbor, Michigan) [17]. All the original cohort studies were designed to determine the incidence of awareness in children, where awareness was defined as the free recall of events that occurred during general anaesthesia.…”