> We acknowledge several major limitations of this study. First, it is not possible to differentiate between active sun exposure habits and a healthy lifestyle,

> We acknowledge several major limitations of this study. First, it is not possible to differentiate between active sun exposure habits and a healthy lifestyle, and secondly, the results are of an observational nature; therefore, a causal link cannot be proven. A further limitation is that we did not have access to exercise data from study initiation; however, similar sHR values were obtained when including exercise for those women who answered the second questionnaire in 2000. This is the rub. We don't know sun-exposure is merely a signal of some healthy lifestyle; but evidence from the later questionnaire suggests that normalizing for exercise still leads to a reduction in risk.