1 Department of Public Health and Infectious Diseases, University of Rome Sapienza, Viale del Policlinico 155, Rome, Italy.
2 Azienda Policlinico Umberto I, Rome, Italy.
3 Department of Anesthesia and Intensive Care Medicine, University of Rome Sapienza, Rome, Italy.
4 Department of Public Health and Infectious Diseases, University of Rome Sapienza, Viale del Policlinico 155, Rome, Italy. mario.venditti@uniroma1.it.
5 Azienda Policlinico Umberto I, Rome, Italy. mario.venditti@uniroma1.it.