1 Princess Margaret Hospital for Children, University of Western Australia, Crawley, WA Seattle Children's Hospital, University of Washington School of Medicine, Seattle, WA Children's Hospital Los Angeles, University of Southern California Keck School of Medicine, Los Angeles, CA Medical College of Virginia, Richmond, VA University of Montreal, Montreal, QC, Canada Penn State College of Medicine, Hershey, PA; on behalf of the Pediatric Acute Lung Injury Consensus Conference.