The authors would like to make the following amendment to their article .
In the paragraph headed “Identification and effect of SNPs…” in the Results section n page 231, the promoter SNP at position −750 should be t>c (−750t reference allele, −750c variant allele). Also in Table 2, the promoter SNP at position −591 should be c>g (−591c reference allele, −591g variant allele). The authors regret these oversights.
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