[1] Univ Cattolica Sacro Cuore, Dept Life Sci & Publ Hlth, Sect Hyg & Publ Hlth, Rome, Italy
[2] Sapienza Univ Roma, Dept Stat Sci, Rome, Italy
[3] San Camillo Forlanini Hosp, Dept Emergency & Acceptance, Orthopaed & Traumatol Unit, Rome, Italy
[4] Univ Verona, Dept Publ Hlth, Verona, Italy