By William Cayley, MD, MDiv, and Brian S. Alper, MD, MSPH

Dr. Cayley is assistant professor in the Eau Claire Family Medicine Residency Program, University of Wisconsin School of Medicine, in Eau Claire, and a reviewer for DynaMed. Dr. Alper is medical director of clinical reference products for EBSCO Publishing, in Ipswich, Mass., and editor-in-chief of DynaMed (www.dynamicmedical.com), a database of comprehensive updated summaries covering nearly…