[1] Hellen Ctr Dis Control & Prevent, Dept Intervent Hlth Care Facil, Athens, Greece
[2] Aristotle Univ Thessaloniki, Dept Microbiol 1, Sch Med, WHO Collaborating Ctr Res & Reference Arboviruses, Thessaloniki, Greece
[3] Univ Athens, Sch Med, Dept Internal Med 4, GR-11527 Athens, Greece
[4] Democritus Univ Thrace, Sch Med, Dept Internal Med 1, Alexandroupolis, Greece
[5] Democritus Univ Thrace, Sch Med, Dept Internal Med 2, Alexandroupolis, Greece