This issue of Primary Care: Clinics in Office Practice, guest edited by Drs. Vincent Morelli, Roger Zoorob, and Joel J. Heidelbaugh, is devoted to Primary Care of the Medically Underserved. This outstanding issue includes the following articles: Primary Care Issues in Rural Populations; Primary Care Issues in Inner City America and Internationally; Medical Care for Undocumented Immigrants: National and International Issues; Pediatric and Adolescent...