289,900
Participants
Start Date
August 31, 1980
Primary Completion Date
August 31, 2012
Study Completion Date
August 31, 2012
Dietary assessments
We use food frequency questionnaires to collect and update intake of foods and nutrients in observational studies. No intervention is involved.
Harvard Medical School (HMS and HSDM)
OTHER
Harvard School of Public Health (HSPH)
OTHER