Michael Drummond1,2, Aleksandra Torbica3, Rosanna Tarricone3. 1. Centre for Health Economics, University of York, York, UK. mike.drummond@york.ac.uk. 2. SDA Bocconi School of Management, Bocconi University, Milan, Italy. mike.drummond@york.ac.uk. 3. SDA Bocconi School of Management, Bocconi University, Milan, Italy.