1. Department of Electrical Engineering, Universidad de Magallanes, Punta Arenas, Chile
2. Department of Electrical Engineering, Universidad de Concepcion, Concepcion, Chile
3. Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, U.K.
4. Institute of Automatics and Industrial Informatics, Universitat Politècnica de València, Valencia, Spain
5. Department of Electrical Engineering, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile