Correction.

The following figures have been modified from the originally published article online:

Figure 1: Now includes the horizontal regression line at SMR = 100 to indicate the level at which no increased risk is observed.

Figure 3: Now includes township group 0, 3, 5 (Twn grp 0, 3, 5). A vertical line has been added to separate the township-specific results within each township, and the 95% CI values have been added to the Twn 2 data point.

Figure 7: 95% CI values have been corrected for female bladder and female lung cancers.