Question: Indicate whether the observational study used is cross-sectional, retrospective, or prospective. Phase II of the Nurses Health Study was started in 1989 with 116,000 female

Indicate whether the observational study used is cross-sectional, retrospective, or prospective.

Phase II of the Nurses’ Health Study was started in 1989 with 116,000 female registered nurses. The study is ongoing.

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