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URL: http://scholar.google.com/scholar_lookup?title=Comparative+validation+of+the+Block%2C+Willett%2C+and+National+Cancer+Institute+food+frequency+questionnaires%3A+the+Eating+at+America%E2%80%99s+Table+Study&year=2001&author=Subar&journal=Am+J+Epidemiol&volume=154&issue=12&pages=1089-1099&doi=10.1093%2Faje%2F154.12.1089&pmid=11744511