1. Rehabilitation Center Club de Leones Cruz del Sur, Punta Arenas 02281, Chile
2. Telecommunications Laboratory (Labtel), Electrical Engineering Department, Federal University of Espírito Santo, Vitória 29047-105, Brazil
3. Institute of Automatics, National University of San Juan, San Juan 5400, Argentina
4. Clinical Hospital Dr. Lautaro Navarro Avaria, Punta Arenas 01364, Chile