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Langenbecks Archiv Fur Chirurgie|November 1, 1977
[Retrograde endoscopic diagnosis and therapy in diseases of the bile papillae and the bile ducts (author's transl)]M Classen, D WurbsScandinavian Journal of Gastroenterology|June 1, 1995
Pantoprazole and ranitidine in the treatment of acute duodenal ulcer. A multicentre studyW Schepp, M ClassenMedizinische Klinik (Munich, Germany : 1983)|December 15, 1993
[Globus pharyngis: indications for flexible endoscopy?]R Lorenz, M ClassenOrvosi Hetilap|December 30, 1991
[Endoscopic papillotomy (sphincterotomy) in the 1990-s]M Classen, H NeuhausZeitschrift Fur Gastroenterologie|November 1, 1983
[Hydrogen (H2) breath tests in the diagnosis of small intestine diseases]H J Wildgrube, M ClassenScandinavian Journal of Gastroenterology. Supplement|January 1, 1984
Anatomical aspects in ultrasonic endoscopyW D Strohm, M ClassenDeutsche Medizinische Wochenschrift (1946)|May 17, 1985
[Endoscopic ultrasonic study of the esophagus]W D Strohm, M ClassenScandinavian Journal of Gastroenterology. Supplement|January 1, 1986
Benign lesions of the upper GI tract by means of endoscopic ultrasonographyW D Strohm, M ClassenEndoscopy|March 1, 1992
Optical resolution and color performance of electronic endoscopesH K Seidlitz, M ClassenUltraschall in Der Medizin (Stuttgart, Germany : 1980)|June 1, 1984
[Endosonography using a gastrofiberscope]W D Strohm, M ClassenPageof 172