1. Department of Business Development and Technology, Aarhus University, Herning, Denmark
2. Department of Statistics, COMSATS Institute of Information Technology, Lahore, Pakistan
3. Department of Management Aarhus BSS, Aarhus University, Aarhus, Denmark
4. Jon M. Huntsman School of Business, Shingo Institute and Management Department, Utah State University, Logan, UT, USA
5. Division of Quality Science, Uppsala University, Visby, Sweden