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Question: Read News Story 12 in the Appendix, "Working nights may increase breast cancer risk." The story describes two separate observational studies, one by Scott Davis and co-authors and one by Francine Laden and co-authors. Both studies and an editorial describing them are included on the CD, and you may need to consult them. In each case, explain whether

a. A case-control study was used or not. If it was, explain how the "controls" were chosen.

b. A retrospective or a prospective study was used.

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