1. M3S Empirical Software Engineering Research Unit, University of Oulu, Oulu, Finland
2. Software Engineering Department, Lappeenranta-Lahti University of Technology, Lappeenranta, Finland
3. School of Business, University of Southern Queensland, Toowoomba, QLD, Australia
4. School of Computer Science, Wuhan University, Wuhan, China
5. Faculty of Information Technology, University of Jyväskylä, Jyväskylä, Finland
6. School of Computing and Communications, Lancaster University Leipzig, Leipzig, Germany
7. Department of Information and Computer Science, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia
8. Faculty of Information Technology and Communication Sciences, Tampere University, Tampere, Finland