Here are the answers to your questions:

1. What tool was used for pathway enrichment analysis?
The article does not specifically mention a tool used for pathway enrichment analysis, but it mentions that KEGG pathway analysis was performed, suggesting that a tool like DAVID or another online platform may have been used, however the specific tool is not described.

2. Was a tool version number provided?
Not described.

3. What gene set library was queried (eg: GO, KEGG, Reactome or other)?
KEGG and GO.

4. Was a background gene list defined for pathway enrichment analysis?
Not described.

5. What statistical test was used for enrichment analysis?
Not described.

6. Was false discovery rate correction used to control the number of false positives in the pathway enrichment analysis?
Not described.