Main outcome measures
Statistical analyses performed
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STATEMENT OF POTENTIAL CONFLICT OF INTEREST No potential conflict of interest was reported by the authors.
FUNDING/SUPPORT This study was funded by the US Department of Agriculture (USDA), Agricultural Research Service, USDA 5450-51000-48-00D and USDA 3062-51000-051-00D.
This study was registered at ClinicalTrials.gov as NCT01674296.