(3) the study must
report a clinical finding or set of findings that can be identified
as the product of an original investigation or report. This criterion
eliminates the repetitive reporting and counting of the same
results, as may occur in review articles or follow-up studies that
summarize previous findings, and (4) the study must use sound
research methods and analytical approaches that provide a clear
test or indication of the relationship between the intervention
and outcome of interest. Because none of the studies in this
updated Advisory met all four criteria, the published literature
could not be used as a source of quantitative support.