Ask Dr. Robert Smith Your Questions About Colonoscopy

Dr. Smith will answer your questions about colonoscopy and colon cancer.

ByABC News
February 9, 2009, 11:14 AM

Mar. 5, 2008— -- Do you have questions about colonoscopy or colon cancer? Dr. Robert Smith is the director of screening for the American Cancer Society and co-author of today's report. Submit your question to Dr. Smith below.