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Endoscopy 1991; 23(2): 108-109
DOI: 10.1055/s-2007-1010631
Letters to the Editor

© Georg Thieme Verlag KG Stuttgart · New York

Endoscopy 22 (1990) 285-286

Olaf Friedrichs
  • St. Barbara-Hospital, W-4100 Duisburg (Hamborn)