[1] Univ Cattolica Sacro Cuore, Dept Internal Med, Rome, Italy
[2] Univ Naples Federico II, Naples, Italy
[3] Pineta Grande Hosp, Diagnost & Intervent Ultrasound Unit, Castel Volturno, Italy
[4] San Giovanni Battista Hosp, Dept Hepatol & Gastroenterol, Turin, Italy
[5] D Cotugno Hosp, Infect Dis & Intervent Ultrasound Unit 9, Naples, Italy
[6] Guglielmo da Saliceto Hosp, Piacenza, Italy
[7] St Orsola Marcello Malpighi Hosp, Bologna, Italy
[8] Belcolle Hosp, Viterbo, Italy