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nurses study is what type of an observational study?

 Nurses’ Health Study The Nurses’ Health Study was started in 1976 with 121,700  female registered nurses who were between the ages of 30 and 55. The subjects were surveyed  in 1976 and every two years thereafter. The study is ongoing.

Given that this is an observational study, explain which type is it. Whether it is restrospective, cross-sectional or prospective.