1. School of Information Systems, Queensland University of Technology, Brisbane, QLD, Australia
2. Departamento de Computação, Universidade Federal Rural de Pernambuco, Recife, Brazil
3. Computer Science & Information Technology, La Trobe University, Bundoora, VIC, Australia
4. Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo, São Paulo, Brazil
5. HIT Lab NZ, University of Canterbury, Christchurch, New Zealand
6. Department of Computer Science and Engineering, INESC-ID, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
7. School of Electrical and Computer Engineering, University of Georgia, Athens, GA, USA