%0 Journal Article %T Strategies to tackle the challenges of external beam radiotherapy for liver tumors %A Edward Y Kim %A Hans T Chung %A Jonathan Klein %A Joseph M Herman %A Michael I Lock %A Nina A Mayr %A Simon S Lo %A William Small %J Archive of "World Journal of Hepatology". %D 2017 %R 10.4254/wjh.v9.i14.645 %K Hepatocellular carcinoma %K Liver metastases %K 4DCT %K Image-guided radiotherapy %K Stereotactic body radiation therapy %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5437609/