1. College of Administrative Science and Informatics, Palestine Polytechnic University (PPU), Hebron, Palestine
2. Department of Agricultural and Consumer Economics, University of Illinois, Urbana, IL, US
3. University of Primorska, Faculty of Management, Koper, Slovenia
4. (CREDA)-UPC-IRTA, Parc Mediterrani de la Tecnologia Edifici ESAB, Barcelona, Spain