1. Centro de Astronomia e AstrofÃsica da Universidade de Lisboa, Tapada da Ajuda, Lisbon, Portugal
2. Research Center for Astronomy and Applied Mathematics, Academy of Athens, Athens, Greece
3. Bioinformatics & Medical Informatics Team, Biomedical Research Foundation of the Academy of Athens, Athens, Greece
4. Computer Engineering and Informatics Department, School of Engineering, University of Patras, Patras, Greece