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Endoscopy|March 1, 1992
Optical resolution and color performance of electronic endoscopesH K Seidlitz, M Classen
Leber, Magen, Darm|December 1, 1981
[Peritoneoscopy and liver biopsy in the diagnosis of liver disease (author's transl)]U Leuschner, M Leuschner, W D Strohm, et al.
Deutsche Medizinische Wochenschrift (1946)|January 5, 1995
[Multicenter prospective study of the current status of treatment for bleeding ulcer in Germany]C Ell, F Hagenmüller, W Schmitt, et al.
Endoscopy|September 1, 1980
Experiences with the long standing nasobiliary tube in biliary diseasesD Wurbs, J Phillip, M Classen
Endoscopy|September 1, 1981
A new method for the endoscopic determination of gastrointestinal ulcer areaH Dancygier, D Wurbs, M Classen
Medizinische Klinik (Munich, Germany : 1983)|October 15, 1994
[Substitution of factor XIII concentrate in treatment refractory ulcerative colitis. A prospective pilot study]R Lorenz, P Born, M Classen
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