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Statistics notebook: entry II.B: Observational study, (1) retrospective study, and (2) prospective study.

P N de Land·W W Chase
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P N de Land, W W Chase. 1991. Statistics notebook: entry II.B: Observational study, (1) retrospective study, and (2) prospective study.. https://doi.org/10.1097/00006324-199102000-00012

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