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Rectal endosonographyHildebrandt, Ulrich; Feifel, Gernot; Ecker, Karl-Wilhelm · 1989
Endosonography of pararectal lymph nodesUlrich Hildebrandt; Thomas Klein; Gernot Feifel; Hans-Peter Schwarz; Bernd Koch; Rainer M. Schmitt · 1990
5 Endosonographic possibilities in the lower alimentary tractUlrich Hildebrandt; Gernot Feifel · 1994
Importance of Endoscopic Ultrasonography Staging for Treatment of Rectal CancerHildebrandt, Ulrich; Feifel, Gernot · Gastrointestinal Endoscopy Clinics of North America · 1995