NOTE: Numbers are estimates based on the number of certifications issued, and may not accurately reflect the number of currently practicing physicians.

^aNumber includes resident members and excludes retired members.

^bNumber includes resident members.

^cNumber includes medical student and resident members.

SOURCES: Number of Board-certified physicians comes from the American Board of Medical Specialties (ABMS, 2004a) and the American Board of Internal Medicine (ABIM, 2005); professional organization membership (limited to physicians of the specified type who may care for adult cancer survivors, in the United States, when possible) comes from: American Society of Clinical Oncology (Personal communication, D. Lopez, ASCO, June 22, 2005); American Society of Breast Surgeons (2005); American Society of Hematology (Personal communication, G. Aklilu, ASH, July 27, 2005); Society of Gynecologic Oncologists (Personal communication, R. Benkert, SGO, January 26, 2005); American Society of Therapeutic Radiation Oncologists (ASTRO, 2002, 2004); Society of Surgical Oncology (Personal communication, R. Slawny, SSO, April 15, 2005); American Urological Association (AUA, 2005); American College of Obstetricians and Gynecologists (Personal communication, C. Flood, ACOG, April 15, 2005); American Society of Colon and Rectal Surgeons (ASCRS, 2005); American College of Physicians (ACP, 2005a); American Society for Therapeutic Radiology and Oncology (Personal communication, S. Smith, ASTRO, June 21, 2005); Society of Thoracic Surgeons (Personal communication, A. Ticoalu, STS, June 23, 2005); American Academy of Family Physicians (AAFP, 2005).