Department of Computer Science and Engineering, via Mura Anteo Zamboni 7, Bologna, Bologna Biocomputing group, via S. Giacomo 9/2, Bologna and Health Sciences and Technologies ICIR, via Tolara di Sopra 41/E, Ozzano dellEmilia, Italy.|Department of Computer Science and Engineering, via Mura Anteo Zamboni 7, Bologna, Bologna Biocomputing group, via S. Giacomo 9/2, Bologna and.|Bologna Biocomputing group, via S. Giacomo 9/2, Bologna and Health Sciences and Technologies ICIR, via Tolara di Sopra 41/E, Ozzano dellEmilia, Italy.