| Study | Reason for exclusion |
|---|---|
| Afifi 1979 | Author did not report data from the patients suffering sickle cell thalassaemia. |
| Cacciola 1990b | Not a randomised clinical trial. |
| Lucena 2007 | Not a randomised clinical trial. |
| Neves 2010 | Case report. |
| Okany 2004 | Not a randomised clinical trial. |
| Paggiaro 2010 | Case study. |
| Sawyer 1979 | Case report including three types of ulcers. |
| Serjeant 1970 | Not a randomised clinical trial. |
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