1. Department of Infectious Diseases, Istituto Superiore di Sanità, Rome, Italy
2. Department of Economics, Università degli Studi “G. d’Annunzio,” Chieti, Italy
3. School of Mathematics and Statistics, University of New South Wales, Sydney, Australia
4. “Sapienza Università di Roma, MEMOTEF,” Rome, Italy
5. Department of Zoology, University of Oxford, Oxford, United Kingdom