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5-HTTLPR and MTHFR 677C>T genotype and allele frequencies. (a) 5-HTTLPR genotype distributions by the two treatment arms. (b) 5-HTTLPR allele frequencies by the two treatment arms. (c) MTHFR 677C>T genotype distributions by the two treatment arms. (d) MTHFR 677C>T allele frequencies by the two treatment arms
