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Are you M. Classen, author of the books below?
Gastroenterology. Yesterday - Today - Tomorrow. a Review and ... by J.L. Boyer Endoscopy & Biopsy Gastroe by Fruhmorgen Dünndarm B by Wolfgang Bommer Der Internist by E. Buchborn Atlas der Enteroskopie by L. Demling Pankreaschirurgie (Die Praxis der Chirurgie) by L.F. Hollender Ulkusalmanach 1+2 (Interdisziplinäre Gastroenterologie) by Peter Bauerfeind Gastroenterologie by Sebastian Reichenberger Endoskopie und Biopsie in der Gastroenterologie by P. Frühmorgen Dünndarm B (Handbuch der inneren Medizin) by W. Bommer


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