5Beck YT,Reed G. Lind CD, et al. The role of elective operation in the treatments of ortal hypertension[J]. Am Surg ,1996,62(1):171.
6Spence KA. The venous anatomy of the lower oseophages in nomal subject and in patients with varices: an im age analysis study[J]. The British Journal of Surgery , 1984, 71 (10):739.