| Study | Reason for exclusion |
|---|---|
| Brouillette 2013 | This article was a commentary on the Marcus 2013 trial |
| Ebell 2013 | This article was a commentary on the Marcus 2013 trial |
| Ramsden 2014 | This article was a commentary on the Marcus 2013 trial |
| Rodriguez 2014 | This article was a commentary on the Marcus 2013 trial |
| Schilder 2014 | This article was a commentary on the Marcus 2013 trial |
| Witmans 2013 | This article was a summary of the results of the Marcus 2013 trial |
| Xie 2010 | ALLOCATION We judged this study to be a quasi‐randomised trial as 30 children with odd numbers were assigned to group A (treatment group) while 30 children with even numbers were assigned to group B (control group) |
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