5Tai P, van Dyk J, Yu E, et al. Variability of target volume delineation in cervical esophageal cancer. Int J Radiat Oncol Bid Phys,1998,42:277-288.
6Abmad M, Nath R. Three-dimensional radiotherapy of head and neck and esophageal carcinomas: a monoisocentric treatment technique to achieve improved dose distributions. Int J Cancer,2001,96:55-65.
8Kutcher GJ, Burman C. Calculation of complication probability factors for non-uniform normal tissue irradiation: the effective volume method.Int J Radiat Oncol Biol Phys,1989,16:1623-1630.
9Lyman JT.Complication probability as assessed from dose volume historgrams.Rad Res,1985,104:S13-S15.
