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.

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

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.