1. Department of Policy and Strategy Studies, Hacettepe University, Ankara, Turkey
2. Department of Operations, University of Groningen, 9700 AV Groningen, Netherlands
3. Department of Management, Cankaya University, Ankara, 06800 Turkey; and Cork University Business School, University College Cork, T12 K8AF, Ireland
4. Business School, University of Edinburgh, Edinburgh EH8 9JS, United Kingdom