1. School of Management, Université du Québec à Montréal, Montréal, Québec H2X 3X2, Canada;
2. Internuniversity Research Centre on Enterprise Networks, Logistics and Transportation (CIRRELT), Montréal, Québec H3C 3J7, Canada;
3. Centre for Shipping and Logistics, Department of Business and Management Science, NHH Norwegian School of Economics, Bergen NO-5045, Norway;
4. Department of Engineering, Tsinghua University, Haidan District, Beijing 100084, China