Affiliation: | 1. Department of Mathematical Sciences and Centre for the Study of Choice and Centre for Health Economics Research and Evaluation , University of Technology , Sydney, PO Box 123, Broadway, NSW 2007, Australia Leonie.Burgess@uts.edu.au;3. Department of Mathematical Sciences, Centre for the Study of Choice , University of Technology , Sydney, PO Box 123, Broadway, NSW 2007, Australia |