Leahy, A., M. Sharkey, M. Wiley and D. Bouchier-Hayes (1996). Unit based Surgical Audit: Measuring the Quality of Clinical Practice, Journal of the Irish Colleges of Physicians and Surgeons, Vol. 25, No. 1, https://www.esri.ie/publications/unit-based-surgical-audit-measuring-the-quality-of-clinical-practice