“…Five studies were based in the USA [26, 32, 35, 36, 38], three in Germany [25, 28, 31], three in Italy [17, 29, 34], and one each in Spain [27], China [9], UK [30], France [33], Belgium [37], and Poland [18]. The 17 prospective randomized controlled studies enrolled patients with distinct primary diseases eligible for OLT such as hepatitis B virus (HBV) [18, 27, 31–33], HCV infection [18, 25–27, 30–33, 35, 36, 38], HCC [9, 17, 26, 27, 30, 31, 33, 37], primary sclerosing cholangitis (PSC) or primary biliary cirrhosis (PBC) [17, 18, 31, 32], alcoholic cirrhosis [17, 18, 26, 27, 31], and autoimmune hepatitis (AIH) [28, 32]. A proportion of selected studies (6/17) described concomitant diseases such as diabetes [27, 29–31, 33], hypertension [27, 31], cytomegalovirus (CMV) infection [33, 34], Epstein-Barr virus (EBV) infection [33, 34], and metabolic disease [31, 33, 34, 37].…”