1. HEC Liège; Management School of the University of Liège; Liege 4000 Belgium
2. Logistikum; University of Applied Sciences Upper Austria; Steyr 4400 Austria
3. Institute of Statistics, Biostatistics and Actuarial Sciences; Université Catholique de Louvain; Louvain-La-Neuve 1348 Belgium
4. Department of Business Administration; University of Delaware; Newark DE USA