1. Istituto di Analisi dei Sistemi e Informatica “A. Ruberti”, Italian National Research Council (IASI-CNR),Roma,Italy
2. University of Milano-Bicocca,Department of Biotechnologies and Biosciences,Milan,Italy,20126
3. University of Delaware,Center for Bioinformatics and Computational Biology,Department of Electrical and Computer Engineering, Biomedical Engineering, Mathematical Sciences,Newark,DE,USA,19716