1. Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
2. INESC-ID and Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
3. Indiana Network Science Institute, Indiana University, Bloomington, IN, USA
4. ATP-Group, IST-Taguspark, Porto Salvo, Portugal
5. Informatics Institute, University of Amsterdam, Amsterdam, Netherlands
6. Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA