1. Department of Anaesthesia, Mater Misericordiae University Hospital, Eccles St, D07 WKW8 Dublin, Ireland
2. Department of Anaesthesia, National Orthopaedic Hospital Cappagh/Mater Misericordiae University Hospital, Eccles St, D07 WKW8 Dublin, Ireland
3. School of Medicine, University College Dublin, D04 V1W8 Dublin, Ireland
4. Department of Anaesthesia, Cork University Hospital, Wilton, T12 DC4A Cork, Ireland
5. The ESA-IC Oncoanaesthesiology Research Group and Outcomes Research, Cleveland, OH 44195, USA