RT Journal Article SR Electronic T1 Addendum 1: Society for Immunotherapy of Cancer (SITC) clinical practice guideline on immunotherapy for the treatment of hepatocellular carcinoma JF Journal for ImmunoTherapy of Cancer JO J Immunother Cancer FD BMJ Publishing Group Ltd SP e002794add1 DO 10.1136/jitc-2021-002794add1 VO 11 IS 9 YR 2023 UL http://jitc.bmj.com/content/11/9/e002794add1.abstract