Closing the gaps in Hatch-Waxman : assuring greater access to affordable pharmaceuticals : hearing before the Committee on Health, Education, Labor, and Pensions, United States Senate, One Hundred Seventh Congress, second session, on examining certain provisions of the 1984 Drug Price Competition and Patent Term Restoration Act, known as the Hatch-Waxman Act, assuring greater access to affordable pharmaceuticals, May 8, 2002.