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JAMA|March 11, 1988
Improvement in bronchial squamous metaplasia in smokers treated with folate and vitamin B12. Report of a preliminary randomized, double-blind intervention trialD C Heimburger, C B Alexander, R Birch, et al.
JAMA|February 1, 1992
Folate deficiency and cervical dysplasiaC E Butterworth, K D Hatch, M Macaluso, et al.
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