1. School of Medicine; Department of Anaesthesia; Mater University Hospital; University College Dublin; Dublin Ireland
2. Department of Cancer Anaesthesia and Pain Medicine; Peter MacCallum Cancer Centre and University of Melbourne; Melbourne Australia
3. Department of Outcomes Research; Anesthesiology Institute; Cleveland Clinic; Cleveland OH USA
4. Mater University Hospital; School of Medicine; University College Dublin, Ireland; Outcomes Research, Consortium; Cleveland OH USA