About the Authors
Division of Respiratory Medicine, Department of Pediatrics, The Hospital for Sick Children, University of Toronto, Toronto, Canada
Program in Physiology and Experimental Medicine, SickKids Research Institute, The Hospital for Sick Children, University of Toronto, Toronto, Canada
The authors have declared that no competing interests exist.
Conceived and designed the experiments: HG JB FR. Performed the experiments: DS ME ML. Analyzed the data: HG JB. Wrote the paper: HG JB FR.