*Assistant Professor of Pediatrics, University of Pennsylvania School of Medicine, and †Fellow, Division of Emergency Medicine, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania.

EDITORS’ NOTE:

This article is the sixth of six that have been published in 2002, for which a total of 6 Category 1 CME credits can be earned. Instructions for how credits can be earned appear on the last page of the Table of Contents.

Dr. Scarfone and Dr. Friedlaender have disclosed that they have no significant relationships with or financial interests in any commercial companies that pertain to this educational activity.

Address for reprints: Richard J. Scarfone, MD, Division of Emergency Medicine, The Children’s Hospital of Philadelphia, 34th Street and Civic Center Boulevard, Philadelphia, PA 19104; e-mail: [email protected]