AFP and hepatocellular carcinoma: An approach to surveil and diagnose HCC recurrence using serum alpha-fetoprotein (AFP) or combined with lens culinaris agglutinin-reactive fraction of AFP (AFP-L3), des-gamma-carboxy prothrombin (DCP)/protein induced by vitamin K absence or antagonist II (PIVKA-II) and routine abdominal ultrasound, or liver multiparametric magnetic resonance imaging (MRI), dynamic contrast-enhanced computed tomography (CT) imaging.