*Emergency Department, Royal Children's Hospital, Melbourne, Vic., Australia; †Murdoch Children's Research Institute, Melbourne, Vic, Australia; ‡Emergency Department, Kidzfirst, Middlemore Hospital, Auckland, New Zealand; and §Emergency Department, Princess Margret Hospital, Perth, WA, Australia.
Grant support from the Murdoch Children's Research Institute, Melbourne, Australia.
Address correspondence and reprint requests to Franz E. Babl, MD, MPH, FRACP, FAAP, University of Melbourne, Emergency Department, Royal Children's Hospital, Flemington Rd, Parkville, Victoria 3052, Australia. E-mail: [email protected].