| Study | Reason for exclusion |
|---|---|
| Grewal 2015 | Not randomised |
| Jindal 2011 | Both groups received infraorbital block. The study compared addition of clonidine to bupivacaine |
| Jonnavithula 2007 | Both groups received infraorbital block. The study compared addition of pethidine to bupivacaine |
| Mane 2011 | Both groups received infraorbital block. The study compared addition of pethidine or fentanyl to bupivacaine |
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