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There is a wide
variety of established tools, instruments, and measures
available for use in symptom research. The following Web
sites provide electronic access to tools in specified areas.
http:/www.jr2.ox.ac.uk/bandolier/band59/NNTcalc.html
This site offers a tool that
will calculate the "Number Needed to Treat" (NNT), a commonly
used summary variable in meta-analyses.
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