| Study | Reason for exclusion |
|---|---|
| Frigati 2011 | A cohort study. |
| Hesseling 2012 | Secondary analysis of Madhi 2011. |
| Iro 2013 | Commentary. |
| le Roux 2009 | Not addressing review outcomes; secondary analysis of Zar 2007. |
| Le Roux 2013 | Cohort study. Secondary analysis of Zar 2007. |
| Marais 2013 | Commentary. |
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