1. Department of Biomedical Sciences, University of Sassari, 07100 Sassari, Italy
2. Department of Science and Technology for Humans and the Environment, Università Campus Bio-Medico di Roma, 00128 Rome, Italy
3. Instituto Rene Rachou, Fundação Oswaldo Cruz, Belo Horizonte 30190-009, MG, Brazil
4. Unit of Medical Statistics and Molecular Epidemiology, Università Campus Bio-Medico di Roma, 00128 Rome, Italy
5. Institute of Human Virlogy and Global Virusn Network Center, Deparment of Biochemistry and Molecular Biology, University for Maryland School of Medicine, Baltimore, MD 21201, USA
6. Department of Veterinary Medicine, University of Sassari, 07100 Sassari, Italy
7. National HIV/AIDS Research Center (CNAIDS), National Institute of Health, 00161 Rome, Italy
8. Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL 32816, USA
9. Department of Biochemical Sciences “A. Rossi Fanelli”, Sapienza Università di Roma, 00185 Rome, Italy
10. Department GEPLI, Libera Università Maria Ss Assunta, 00193 Rome, Italy