1. Area of Mathematics, Gran Sasso Science Institute, viale F. Crispi 7, 67100 L'Aquila, Italy
2. CDLab – Computational Dynamics Laboratory, University of Udine, Italy
3. Department of Mathematics, Computer Science and Physics, University of Udine, via delle Scienze 206, 33100 Udine, Italy
4. Department of Mathematics, The University of Manchester, Oxford Rd, M13 9PL, Manchester, United Kingdom
5. Joint UNIversities Pandemic and Epidemiological Research, United Kingdom