Frequencies of the 5-HTTLPR alleles and polymorphisms of the included studies&.

S, short allele; L, long allele; S' as S + LG; and L' as LA.&Dominant model (S+ vs LL or S'+vs L'L'): S+ (or S'+) genotype frequencies are calculated as the sum of SS (or S'S') and SL (or S'L') frequencies. Recessive model (SS vs L+ or S'S' vs L'+): L+ (or L'+) genotype frequencies are calculated by the sum of LL (or L'L') and SL (or SvL') genotype frequencies.