1. Business and Sociology Department, University of Extremadura, Avda de la Universidad s/n, 10071 Cáceres (Extremadura), Spain
2. Department of Construction and Manufacturing, Engineering, University of Oviedo, Calle Gonzalo Gutiérrez Quirós s/n, 33600 Mieres, Spain, España
3. Department of Business Management, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa