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| Study | Reason for exclusion |
|---|---|
| Arya 2013 | Not an RCT |
| Bodalia 2013 | Not an RCT |
| Crawford 1987 | No seizure data recorded |
| Jacoby 2015 | Ineligible population (new‐onset epilepsy) |
| Korean Gabapentin Study Group 2000 | No gabapentin in add‐on (sodium valproate in add‐on) |
| Nonoda 2014 | Ineligible population (no refractory epilepsy) |
| Ohtsuka 2014 | Not an RCT |
| Semah 2014 | No gabapentin in add‐on |
RCT: randomised controlled trial.
