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Table S1 An example of PubMed citation in the PubMed XML tagged format.

Table S2 Purpose and procedure.

Appendix S1 Flowchart: getting the impact factor (IF) of a journal. JIF, journal impact factor.

Appendix S2 Flow chart: getting the study design [or research type (RT)]. Step 1: keyword matching to the title. Step 2: keyword matching to the MeSH terms. Step 3: keyword matching to the abstract text.

Appendix S3 Flow chart: getting subjects (human vs. non-human studies) and the ranges of ages.

Appendix S4 Flow chart: getting number of subjects.

Appendix S5 Flow chart: getting P-value and 95% confidence interval (CI) for the main measurement.

FilenameFormatSizeDescription
JEP_1712_sm_A1-5.doc401KSupporting info item
JEP_1712_sm_t1-2.doc123KSupporting info item

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