1. IEETA, Institute of Electronics and Informatics Engineering of Aveiro, and LASI, Intelligent Systems Associate Laboratory, University of Aveiro, Campus Universitário de Santiago , 3810-193 Aveiro , Portugal
2. Department of Electronics Telecommunications and Informatics, University of Aveiro, Campus Universitario de Santiago , 3810-193, Aveiro , Portugal
3. Functional Genomics Center Zurich, ETH Zurich and University of Zurich, Winterthurerstrasse , 190, 8057, Zurich , Switzerland
4. SIB, Swiss Institute of Bioinformatics , 1202, Geneva , Switzerland
5. Department of Virology, University of Helsinki, Haartmaninkatu , 3, 00014 Helsinki , Finland