1. Department of Oral Rehabilitation, Instituto Superior de Ciencias da Saude - Norte, Gandra, Portugal.
2. Industrial Engineer, Chairman of Idearum, Enginyeria i Innovació de Producte, Igualada, Barcelona, Spain.
3. Department of Production and Systems Engineering, University of Minho (UM), Braga, Portugal.
4. Department of Rehabilitation and Maxillofacial Prostheses, Faculty of Odontology, University of Barcelona, Barcelona, Spain.