1 Institute of Infectious Diseases and Public Health, Università Politecnica delle Marche, Ancona, Italy.
2 Department of Therapeutic Research and Medicines Evaluation, Istituto Superiore di Sanità, Viale Regina Elena, 299 00161 Rome, Italy. [email protected].
3 Department of Therapeutic Research and Medicines Evaluation, Istituto Superiore di Sanità, Rome, Italy.
4 Department of Infectious Diseases, Ospedale Civile di Pescara, Italy.