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INVITED EDITORIALS

Risk of breast cancer among users of estrogen plus progestogen and unopposed estrogen: is the likelihood of bias symmetrical?

 

Acknowledgement

I thank Henry Burger for valuable suggestions. In particular, he reminded me of the need to consider absolute as well as relative risks.

Conflict of interest The author presently consults, and in the past has consulted, with manufacturers of hormone replacement therapy products.

Source of funding Nil.

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