1 Department of Pediatric Emergency Medicine, Sidra Medical and Research Centre, Doha, Qatar; Department of Pediatrics, Division of Pediatric Emergency Medicine, Hamad Medical Corporation, Doha, Qatar; Weill Cornell Medical College, Doha, Qatar. Electronic address: dkmaa@hotmail.com.
2 Pulmonary-Critical Care Medicine Division, University of Washington School of Medicine, Seattle, WA.