4,000
Participants
Start Date
November 30, 2006
Primary Completion Date
May 31, 2012
Study Completion Date
July 31, 2013
Folic acid: 4 mg versus 0.4 mg per day
Folic acid
University of Iowa, Iowa City
National Institute of Dental and Craniofacial Research (NIDCR)
NIH
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NIH
RTI International
OTHER
University of Sao Paulo
OTHER
University of Iowa
OTHER