This search generated records of 599 patients that fitted the inclusion criteria. After the population was identified, a sample size calculation was performed. As this audit is based on standards of 100%, the likelihood of a positive response for measured criteria is high, therefore a response distribution of 90% was chosen. To detect a statistical effect with a confidence level of 95%, and 5% margin of error, the minimum sample size required is 113. Using the statistical package for social sciences (SPSS) version 18.1, a simple randomisation scheme was employed, and 120 patients were identified.