1. Department of Industrial Engineering, Universidad de Chile, Santiago, Chile;
2. Institute for Mathematical and Computational Engineering, Facultad de Matemáticas y Escuela de Ingeniería, Pontificia Universidad Católica de Chile, Santiago, Chile;
3. School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece;
4. Department of Electrical and Computer Engineering, Cockrell School of Engineering, University of Texas at Austin, Austin, Texas 78712;
5. School of Business and Economics, Maastricht University, 6211 LM Maastricht, Netherlands