Medline	Embase	Cochrane
1	exp DIARRHEA/	49,612	228,556	3029
2	exp RADIOTHERAPY/	168,386	479,346	5602
3	Radiation-induced Diarrhea.mp.	53	72	30
4	exp PROBIOTICS/	13,609	28,098	1590
5	exp SYNBIOTICS/	356	1200	96
6	exp LACTOBACILLUS/	25,693	39,707	1365
7	exp BIFIDOBACTERIUM/	5163	10,399	552
8	exp SACCHAROMYCES/	104,336	98,961	138
9	exp Enterococcus/	18,010	43,801	249
10	exp BIFIDOBACTERIUM/	5163	10,399	552
11	exp Randomized Controlled Trials as Topic/	119,100	146,594	7449
12	exp Clinical Trial/	800,652	1,329,589	173
13	random$.ab.	956,882	1,275,640	599,733
14	4 or 5 or 6 or 7 or 8 or 9 or 10	156,392	196,258	2516
15	1 or 2 or 3	217,601	697,441	8569
16	11 or 12 or 13	1,460,326	2,207,279	601,980
17	14 and 15 and 16	485	2382	229
18	limit 17 to (humans and yr = “2016–2018”)	44	308	21