Bromet says the study findings can help countries identify their own high-risk populations, whether it's older adults in Ukraine or young divorced women in Japan.

CNN: People in affluent nations may be more depression-prone

Even if the woman knows she has a family history of breast cancer, which increases her own risk of developing it, it is useful to know whether BRCA1 or BRCA2 is present in its mutated form.

BBC: DNA spiral