Endoscopic difficulties in the diagnosis of upper gastrointestinal bleeding.
Appleyard
M N
MN
Department of Gastroenterology, Barts and The London NHS Trust, London E1 1BB, UK.
Swain
C P
CP
D016888:Angiodysplasia / Q000175:diagnosis*; D016099:Endoscopy, Gastrointestinal / Q000379:methods*; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans