Data Selection & Collection Process
All titles identified by the initial literature search were independently reviewed by two authors (LML and PDC) and the abstract and/or full text was reviewed where required. Data were extracted from papers that met the inclusion criteria by two authors. Extracted data included study type, sample size, surgical technique, study population characteristics, follow-up period, outcome measures, complications of surgery, and symptom outcomes. Any differences in extracted data were discussed and any disagreements resolved by the senior author (DE).