| Study | Reason for exclusion |
|---|---|
| Basiri 2009 | Conference abstract, 27th WCE & SWL only. Full study not available. Author contacted without a response. Relates to the Basiri 2010 included study. |
| Burgu 2009 | Conference abstract ESPU 2009. Same data as the included Aydogdu study. |
| Saad 2015 | Used renal units |
| Samad 2012 | Used renal units |
| Zaidi 2009 | Conference abstract ESPU 2009. Same data as the Samad 2012 paper. |
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