1. Department of Computer Science and Biomedical Informatics, University of Thessaly, 35100 Lamia, Greece
2. Disease Systems Biology Program, Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, DK-2200 Copenhagen, Denmark
3. Department of Health Technology, Section for Bioinformatics, Technical University of Denmark, DK-2800 Kgs Lyngby, Denmark