From the Childrens' Clinic, Calgary, AB, Canada. Address reprint requests to Dr. Robson at the Children's Clinic, Suite 111, 4411 16th Ave. NW, Calgary, AB T3B 0M3, Canada, or at [email protected].
An audio version of this article is available at NEJM.org.
No potential conflict of interest relevant to this article was reported.
I thank Dr. Gil Rushton, Dr. Richard Butler, and Louise Thompson, R.N., for their helpful suggestions.
New England Journal of Medicine 360(14):p 1429-1436, April 2, 2009. | DOI: 10.1056/NEJMcp0808009
