1. Electrical and Computer Eng. Dept., Interactive Technologies Laboratory, University of Patras, Greece
2. Department of History and Archaeology, National and Kapodistrian University of Athens, Greece
3. Cyprus Interaction Lab, Department of Multimedia and Graphic Arts, Cyprus University of Technology, Cyprus and CYENS Center of Excellence, Cyprus
4. Electrical and Computer Eng. Dept., Interactive Technologies Lab, University of Patras, Greece