1. Safety, Reliability and Maintenance Group of CENTEC – IST, Instituto Superior Técnico, Technical University of Lisbon, Portugal
2. Department of Mechanical and Industrial Engineering, Faculty of Science and Technology, Universidade Nova de Lisboa, FCT-UNL, Portugal
3. CIS – Centro de Investigação e Intervenção Social, ISCTE – IUL, Instituto Universitário de Lisboa, Portugal