Endoscopy procedures at the U.S. Department of Veterans Affairs : what happened, what has changed? : hearing before the Subcommittee on Oversight and Investigations of the Committee on Veterans' Affairs, U.S. House of Representatives, One Hundred Eleventh Congress, first session, June16, 2009.United States. Congress. House. Committee on Veterans' Affairs. Subcommittee on Oversight and Investigations.2009ZIP