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Classification Protocol

Studies were classified according to an algorithm based on an established method for classifying human health studies by epidemiological study type (Kramer MS, Boivin JF. Toward an "unconfounded" classification of epidemiologic research design. Journal of Chronic Disease 1987; 40(7):683-8) for classification of epidemiologic studies. The figure below presents the inclusion criteria and classification algorithm that is a modified version of Kramer and Boivin's method.

For definitions, see the glossary.

 

classification algorithm

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