Interobserver Variations in Target Delineation in Intensity-Modulated Radiation Therapy for Nasopharyngeal Carcinoma and its Impact on Target Dose Coverage oleh Xu Liu MM, Huixian Huang MM, Chaohua Zhu MM, Qihuan Gan MM, Hailan Jiang MM, Pei Liu MM, Xin Qi MM, Fangfang Fan MM, Jinru Xiao MM, Qiang Pang MM, Zhiping Lu MM, Heming Lu MD