| Author and year | Intervention | Control | Treatment duration | Follow up |
|---|---|---|---|---|
| Bauserman M et al. 2005 [107] |
Lactobacillus GG 1010 bacteria twice per day |
Placebo (inulin) | 6 weeks | No follow up after treatment period |
| Francavilla R et al. 2010 [108] |
Lactobacillus GG 3X109 CFU twice per day | Placebo | 8 weeks | 8 weeks |
| Guandalini S et al. 2010 [109] |
VSL#3 1 sachet once per day 4-11 years Twice per day 12–18 years | Placebo | 6 weeks | 6 weeks a |
| Giannetti e et al. 2017 [110] | Bifidobaacterium longum BB536 3 billions, Bifidobacterium infantis M-63 1 billion, Bifidobacterium breve M-16 V 1 billion | Placebo | 6 weeks | 6 weeks a |
| Gawrońska A et al. 2007 [112] |
Lactobacillus GG 3X109 twice per day | Placebo | 4 weeks | No follow up after treatment period |
|
Kianifar H et al 2015 [113] | Lactobacillus GG 1X1010 CFU/ml twice per day | Placebo | 4 weeks |
No follow up after treatment period |