*Clinical Assistant Professor, Alberta Children's Hospital/University of Calgary, Canada and †Associate Professor Departments of Pediatrics and Pharmacology and Therapeutics, University of Calgary, Faculty of Medicine, Alberta Children's Hospital, Canada. Drs. Bjornson and Johnson have disclosed that they have no significant relationship with or financial interests in any commercial companies that pertain to this educational activity. Wolters Kluwer Health has identified and resolved all faculty conflicts of interest regarding this educational activity. Address correspondence and reprint requests to David W. Johnson, MD, Departments of Pediatrics and Pharmacology and Therapeutics, University of Calgary, Faculty of Medicine, Alberta Children's Hospital, Canada.
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Bjornson et al. (2005) studied this question.
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