1. Departmento de Automática, Universidad de Alcalá, Madrid, Spain
2. Departamento de Ciencias de la Computación, Universidad de Alcalá, Madrid, Spain
3. Business and Sociology Department, University of Extremadura, Cáceres, Spain
4. Business Economic Department (Administration, Management and Organization), Applied Economics II and Fundamentals of Economic analysis, Universidad Rey Juan Carlos, Madrid, Spain