2 . 6 Palazzo L,Roseau G,Salmeron M . Endoscopic ul trasonography in the preoperative localization of pan creatic endocrine tumors . Endoscopy,1992,24(Suppl.4 .程敬民,金震东,许国铭,等.超声内镜对胰腺肿瘤早期诊断的进展.中国超声医学杂志,1999,15. ......