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| Overview | Reason for exclusion |
| da Costa 2014 | Opioids studied but not at high doses specifically |
| Derry 2016 | Opioids studied but not at high doses specifically |
| Haroutiunian 2012 | Opioids studied but not at high doses specifically |
| Moore 2015 | No opioids studied |
| Noble 2010 | Opioids studied but not at high doses specifically |
| O'Connell 2013 | No opioids studied |
| Rubinstein 2011 | Opioids studied but not at high doses specifically |
