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Question 6: If women who choose to take hormones are healthier to begin with than women who choose not to.J why might that systematically bias
Question 6: If women who choose to take hormones are healthier to begin with than women who choose not to.J why might that systematically bias the results of observational studies like the NHS? Would we expect observational studies to overestimate or underestimate the protective effect of HRT'? Write your answer here, replacing this text
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