[1] Polyklin Gen Hosp, Dept Gastroenterol, Athens, Greece
[2] IKA, Reference Ctr Hepatitis, Athens, Greece
[3] Univ Thessaloniki, Dept Internal Med 4, GR-54006 Thessaloniki, Greece
[4] Evangelismos Gen Hosp, Dept Gastroenterol 2, Athens, Greece
[5] Naval Hosp Athens, Dept Internal Med 1, Athens, Greece
[6] IKA, Gen Hosp, Dept Internal Med 2, Athens, Greece