1. Southampton Business School and CORMSIS, University of Southampton, Southampton, SO17 1BJ, UK
2. Interuniversity Research Centre on Enterprise Networks, Logistics and Transportation (CIRRELT) and School of Management, Université du Québec à Montréal, P.O. Box 8888, Station Centre-Ville, Montréal, Canada H3C 3P8, Canada
3. School of Industrial Engineering, Eindhoven University of Technology, Eindhoven 5600MB, The Netherlands