Table 1.

Literature search algorithm—PubMed; EMBASE (via OVID); and Cochrane Library.

Database	Search Number	Search Terms
PubMed	Search #1	“microbiota” OR “gastrointestinal microbiome” OR “microbiome” OR “16s rRNA”
	Search #2	“radiation” OR “radiotherapy”
	Search #3	Search #1 AND Search #2
EMBASE (via OVID)	Search #1	“microbiota” OR “gastrointestinal microbiome” OR “microbiome” OR “16s rRNA” OR “microflora”
	Search #2	“radiation” OR “radiotherapy”
	Search #3	English OR Spanish OR Portuguese
	Search #4	Search #1 AND Search #2 AND Search #3
Cochrane Library	Search #1	“microbiota” OR “gastrointestinal microbiome” OR “microbiome” OR “16s rRNA” OR “microflora”
	Search #2	“radiation” OR “radiotherapy”
	Search #3	Search #1 AND Search #2