Kung NN, Sung JJ,Yuen N W,et al . Anti‐Helicobactor pylori treat ment in bleeding ulcer:ran domized controlled trail comparing 2‐day versus 7‐day bismuth quadruple therapy . Am J Gastroen terol,1997.Leussink BT, Nagelkerke JF,van de Water B,et al . Pathwa ......