Affiliation: | 1.Centre for Transport & Society, Department of Geography and Environmental Management, University of the West of England, Bristol, BS16 1QY, UK ;2.Academic Unit of Health Economics, Leeds Institute of Health Sciences, University of Leeds, Leeds, LS2 9NL, UK ;3.Transport Research Institute, Edinburgh Napier University, Merchiston Campus, 10 Colinton Road, Edinburgh, EH10 5DT, UK ; |