[1] Univ Ferrara, Dept Med Sci, Ferrara, Italy
[2] Reg Healthcare Agcy Abruzzo Reg, Pescara, Italy
[3] Univ Turin, Dept Publ Hlth Sci, Turin, Italy
[4] Local Hlth Author South Tyrol, Bolzano, Italy
[5] Sapienza Univ Rome, Dept Publ Hlth & Infect Dis, Rome, Italy
[6] Italian Natl Inst Hlth, Rome, Italy