Inclusion and exclusion criteria for this group were the same as the smokers group. The excluded cases are shown in Table 1. Data collection method was also the same. Thus, the only difference between the two groups was cigarette smoking
Inclusion and exclusion criteria for this group were the sameas the smokers group.The excluded cases are shown in Table 1.Data collection method was also the same. Thus, the onlydifference between the two groups was cigarette smoking