| Study | Reason for exclusion |
|---|---|
| Baker 2009 | Primary paper was not a randomised controlled trial (RCT). |
| Becker 2008 | Pharmacogenetic analyses presented results from pooled (not individual) allelotyping (Drgon 2009). This investigation analysed results from Becker 2008 (no data available). |
| Uhl 2007 | Pharmacogenetic analyses presented results from pooled (not individual) allelotyping (Uhl 2008). This investigation analysed results from Lerman 2002, Lerman 2004, David 2007, and Uhl 2007 (no data available). |
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