ref.: reference group. aMultivariate OR values were adjusted for age, gender, educational level, and cumulative cigarette smoking. *p<0.05 by trend test.
aP-value of the chi-square goodness of fit test for Hardy-Weinberg equilibrium (HWE) in controls.bthe HWE test can not be conducted because only the total number of genotypes (TT vs. CT/CC) was availa