title: The authors reply.
authors.affiliation: Los Angeles, CA; Department of Emergency Medicine, University of South Carolina School of Medicine, Piedmont Hospital, Newnan, Georgia; Department of Critical Care Medicine, National and & Gulf Center for evidence based health practice, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia, Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, ON, Canada; Foothills Medical Centre, University of Calgary, Calgary, AB, Canada; Division of Pulmonary and Critical Care Medicine, Eastern Virginia Medical School, Norfolk, VA.
authors.forename: Heidi L
authors.initials: HL
authors.lastname: Frankel
authors.forename: Michael
authors.initials: M
authors.lastname: Blaivas
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Elbarbary
authors.forename: Andrew W
authors.initials: AW
authors.lastname: Kirkpatrick
authors.forename: Alexander
authors.initials: A
authors.lastname: Levitov