11.   There was no difference in the rate of bladder, breast, or head or neck cancers.

n. + cancer >>共 166
breast 37.72%
lung 21.22%
colon 9.27%
skin 8.18%
brain 3.34%
stomach 3.34%
throat 2.19%
bone 2.12%
thyroid 1.86%
bladder 1.33%
neck 0.21%
neck + n. >>共 157
injury 28.76%
brace 11.35%
surgery 6.62%
pain 6.34%
muscle 3.78%
problem 3.03%
stiffness 2.84%
strain 2.37%
area 1.70%
wound 1.51%
cancer 1.04%
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