6Stiegmann GV, Gambre T, Sun JH.A new endoscopic elastic band ligating deviee[J].Gastrointest Endosc,2006,32(5):230.
7Argonz J,Kravelz D,Suarez A,etal.Variceal band ligation and variceal bleeding in cirrhotic patients: a randomized,prospective and cotrolled trial[J].Gastrointest Endosc,2003,51 (2): 157.