Medical Practice and the Double-Blind, Randomized Controlled Trial
Charlton, Bruce G.
BRITISH JOURNAL OF GENERAL PRACTICE 1991 September; 41(350): 355-356
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Double-blind randomized controlled trial of folate treatment before conception to prevent recurrence of neural-tube defects Laurence, K.M. James N.; Miller, M.; Tennant, G.B.; Campbell, H. (1981-05-09)