Mohammad Faraz Khan1,2, Ed Murphy1, Alice Moynihan1, Ronan A Cahill3,4. 1. Department of Surgery, Mater Misericordiae University Hospital, Dublin, Ireland. 2. UCD Centre for Precision Surgery, Section of Surgery, School of Medicine, University College Dublin, Dublin, Ireland. 3. Department of Surgery, Mater Misericordiae University Hospital, Dublin, Ireland. ronan.cahill@ucd.ie. 4. UCD Centre for Precision Surgery, Section of Surgery, School of Medicine, University College Dublin, Dublin, Ireland. ronan.cahill@ucd.ie.