1,121
Participants
Start Date
February 29, 1992
Study Completion Date
January 31, 2007
Aspirin
Folate
USC/Kaiser, Los Angeles
University of Colorado, Denver
University of Iowa, Iowa City
Henry Ford Health Sciences Center, Detroit
University of Minnesota, Minneapolis
University of North Carolina, Chapel Hill
Cleveland Clinic Foundation, Cleveland
University of Toronto, Toronto
Dartmouth Hitchcock Medical Center, Lebanon
National Cancer Institute (NCI)
NIH
Dartmouth-Hitchcock Medical Center
OTHER