1 Clinica Malattie Infettive, Azienda Ospedaliera Universitaria Santa Maria della Misericordia Piazzale Santa Maria della, Misericordia 15, 33100, Udine, Italy. mattba@tin.it.
2 Alfa Institute of Biomedical Sciences (AIBS), Athens, Greece.
3 Department of Internal Medicine-Infectious Diseases, Iaso General Hospital, Athens, Greece.
4 Department of Medicine, Tufts University School of Medicine, Boston, MA, USA.
5 Division of Pulmonary and Critical Care Medicine, Washington University School of Medicine, St. Louis, MO, USA.