1. Instituto Superior Técnico, University of Lisbon & INESC-ID & State University of Rio Grande do Norte, Lisbon, Portugal
2. Instituto Superior Técnico, University of Lisbon & INESC-ID, Lisbon, Portugal
3. Instituto Universitário de Lisboa (ISCTE-IUL) CIS-IUL & INESC-ID, Lisbon, Portugal
4. Instituto Superior Técnico, Universtity of Lisbon & INESC-ID, Lisbon, Portugal