1. These authors contributed equally to this work and share first authorship.
2. Department of Health Sciences, Università degli Studi di Milano, Milan, Italy
3. Department of Clinical Sciences and Community Health, Università degli Studi di Milano, Milan, Italy
4. Coordinated Research Center “EpiSoMI”, Università Degli Studi di Milano, Milan, Italy
5. Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, Denmark
6. Department of Infectious Diseases, Istituto Superiore di Sanità, Rome, Italy