Comparison of coplanar and noncoplanar intensity-modulated radiation therapy and helical tomotherapy for hepatocellular carcinoma oleh Tai Hung-Chi, Lin Shee-Chan, Wang Tsang-En, Lin Ching-Chung, Chen Ming-Jen, Chen Chih-Jen, Chong Ngot-Swan, Shueng Pei-Wei, Liu Chia-Yuan, Hsieh Chen-Hsi, Tien Hui-Ju, Chen Kuo-Hsin, Wang Li-Ying, Hsieh Yen-Ping, Huang David YC, Chen Yu-Jen