1. Department of Systems and Information Engineering, University of Virginia, Charlottesville, VA, USA
2. National Research Council of Canada, Ottawa, Canada
3. Fraunhofer IAIS, Germany
4. School of Mathematical Sciences, Monash University, Wellington Road, Clayton, Victoria, Australia
5. School of Management, University of Southampton, Southampton, UK
6. Department of Industrial Engineering, Universidad de Chile, República, Santiago, Chile
7. Yahoo! Research, Barcelona, Spain
8. Groupon Inc., Palo Alto, CA, USA
9. Faculty of Engineering and Applied Sciences, Universidad de los Andes, Las Condes, Santiago, Chile